When Leonard said that, Dae-Seong just chuckled and said, "I only asked what it was, I never said I wanted you to teach it to me." he said as he stood up and dusted himself off and then looked up to grin to Leonard since he was already of thinking of teaching him the skill.
Once Dae-Seong said that, Leonard just chuckled and said, "Yeah, yeah, I'll make the training harder so you'll learn it faster.", as he said this, Dae-Seong now knew he was screwed and should've just kept his mouth shut before things became worse.
Then after saying that, Leonard started to tell and explain the basis of how to use the spirit armour skill and the gist of it was that, Dae-Seong needed to use his origin sword energy to let Corban's spirit form fuse into his own body.
Like melting him into his own armour and so after explaining all of that, Leonard made Dae-Seong practice it on his own without showing any demonstration whatsoever, mostly because he wanted to see the might genius blunder and a little payback for before.
But as Dae-Seong was trying it, he was actually able to control his origin energy well, it was thanks to him controlling multiple origin energies so controlling just one energy was like child's play for him and so Dae-Seong was able to do the start of it.
Although when trying to fuse Corban into his armour, luckily Dae-Seong did it correctly so that Corban wouldn't feel any pain but the way he created the armour wasn't exactly perfect since as he wore it, there was a lot of restriction in his movement.
So of course, he thought he had already failed on doing the skill but as Leonard was watching this, he felt extremely cheated, because even though before learning this skill, he was proficient in origin energy control, the way of fusing and controlling were different.
Which meant he had to learn a whole new way to control the origin energy but Dae-Seong was still able to do it without learning the correct way and he even did it perfectly without hurting Corban and even Cline was a bit jealous of that.
Since when Leonard practiced this for the first couple of times, he went through he'll being melted down and being failed to put on as armour and Leonard wasn't even able to create a usable armour during the first year of his training for it.
Except right now, Dae-Seong just needed to refine the armour a bit and it was all good, so he was incredibly annoyed by it but then started to show it to Dae-Seong directly since even though he was better than him, he just covered it up saying that he was teaching a monstrous talent.
Upon showing to Dae-Seong, his eyes thanks to his passive skills that he still had from the system was able to follow each movement pretty well and so he decided to quickly try again before he forgot any of the steps he just watched from Leonard.
Now, Dae-Seong then started to cover Corban with his energy and quickly but carefully melted him down with ease and now he needed to visualize where and how the armour will be put on and that was pretty easy for Dae-Seong with his other passive skills.
As he visualized it, he first did it slowly to correctly build the base and once he finished that, he then started filling in the gaps and making the full armour around himself even adding some extensions onto the armour and he was done.
Leonard as he watched this was extremely surprised even Cline was surprised since Corban's body was able to create so much spirit metal that Dae-Seong was able to create extensions for his armour already without even knowing hoe to conserve the metal.
After Dae-Seong created the spirit armour correctly, he now felt a huge surge in his spirit origin energy, although he felt this before when he created the deformed armour, he was able to really feel the amount of origin energy that flew in now.
This felt very nice for Dae-Seong and so he decided to try it out, and also used the extension he created, the extensions were mostly spikes and blades made onto his armour but there was also a perfect blade on each of his hands.
So he was still able to use his swordsmanship but as he tried it, there was still some parts that didn't feel natural since this was his first time using it but he definitely felt like he became more powerful since even if he was just moving his arms gently.
He could hear the sound of the wind being slashed and so after trying out everything for a bit, he wanted to try it out on a test dummy and so he then looked at Leonard in excitement as he said, "Fine." he said as he snapped his fingers.
Suddenly the room then started to reform as Dae-Seong's platform was being moved into another room and Leonard created some dummies like the ones that Dae-Seong fought before but they were even more powerful than before.
Mostly thanks to him giving them loads of sword origin energy so that they would be a lot more sturdy and even able to use the sword properly but as Dae-Seong just walked towards them they then tried attacking him all at once trying to jump him.
They then suddenly fell to the ground as they were now bit and pieces sliced onto the ground and Dae-Seong didn't even seem to move and so Leonard was impressed since even he had trouble following Dae-Seong blade this time.
When Dae-Seong finished slicing up all the dummies that Leonard made for him, he then went up to him and asked, "What's next?" he said as he was excited to get even stronger but when he asked this, Leonard suddenly became nervous.
It was also very visible on his face and so he then said, "Umm, well, I thought you everything I know?" he said in a confused tone since he, himself didn't expect Dae-Seong to learn everything this fast and he thought it would take a while for him to learn swordsmanship.
But along with swordsmanship he was able to learn Daggers, Scythes, and even a Spear alongside his swordsmanship so Leonard didn't even know what to do at this point and so he then said, "Ok, well, I think we're done with this training.".
Leonard said this as he snapped his fingers and a gate opened as he said, "Come on, let's show Bren and Dalfine what you learned." he said as he chuckled a bit and Leonard even chuckled to himself since he could brag that Dae-Seong learned from him and not her.