During the long agonizing seconds of Erwin trying to figure out how portals work until he came to the conclusion that he was just an idiot.
"Its just like a mirror possibly a glass pane maybe."
He thinks to himself when his gaze looks upon his pile of item and got an idea.
"Maybe instead of using my hands how about something similar to an actual portal gun."
Erwin walked over to the pile of items and found the thing he need the terrain tool and back pack which he wore on his back and held the terrain tool in his front.
"Now to actually function as a portal gun I have to now infuse my powers into the terrain tool and remember how portals work."
With new found few second knowledge Erwin attempted to recreated the portal gun in this universe as he tried to imbue the tool with his Imaginary element nothing happens.
"Hmm...this will be hard I know about giving power to inanimate objects was hard but not this hard."
Erwin contemplated as he is trying to remember every manga, game and fanfics on how they imbue their weapons and items for maximum damage.
"Hmm...-" As he put down the terrain tool and contemplated while thinking how he can use manga knowledge, gamer statistics and the power of fanfiction to make his tool use the Imaginary element -"Lets not get too complicated on this idea, I should shorten it to fit my style cause their is no way ill remember everything."
"Well portal's should be like glass panes" he deduced " but maybe I should think of something else after all glass in not a good analogy about portals."
Erwin said after his dialogue though of another idea on how portals should work in which he is putting more of his brain juice into thinking.
"Come on NASA training remember anything about traveling to space or anything related to it" While Erwin is brain storming the terrain tool on the ground is glowing in yellow light signaling that whatever Erwin is doing is working.
When that light signaled is glowing Erwin who was brain storming his thoughts' opened his eyes and saw that the terrain tool is glowing in yellow light he stopped his brain storming and rushed to grab the terrain tool.
"Maybe its the intention or purpose on how its used," Erwin holding the terrain tool then asked himself "If that's the case I should have imagined it like point A to point B like a door but instead of the other side of the door, its about opening to another place than what the outside is."
Erwin in his revelation gave the terrain tool another chance poured in his power and intent to open a portal from his room to somewhere inside the Express during which his first though was the bathroom which a press the blow button which charges it which he then releases it till it hit the wall and a portal grows from its initial projectile to the size a few inches above his height.
"Holy shit!?" exclaimed by Erwin in a low tone to not disturb anyone who heard it from outside his room.
The other side of the portal Erwin saw is the exact bathroom he used this morning when this was shown his bladder and bowl movements seem to found its calling and Erwin responded to the calling by going inside the bathroom with his backpack and shrunken terrain tool to do a dook-dook with a golden shower.
After a few minutes later the portal which closed a few seconds after Erwin entered opened again but this time from the bathroom to his bedroom was Erwin's portal destination this time.
"Damn that was useful," Erwin who just flushed and went out of the portal "but seriously tho I'm so gonna abuse this."
The excited Erwin after using his terrain tool to become a make shift portal wanted to do the same thing without using any items but is met with exhaustion and disappointment from his small ring of a portal which disappeared after a few seconds.
"My disappointment is immeasurable," The exhausted Erwin said to his self while currently on the floor "and I need rest for the rest of the hour."
"This shit is much more harder than how Dr. Strange does it" With the angsty Erwin proclaiming his view on marvel movies while lying on a comfy bed whom he crawled on to.
Erwin who is resting is disturbed by the knock on his bedroom door, with a simple 'come in' which he shouted weakly, with the door opened with March who came in and seeing Erwin resting on bed spoke first.
"Wow, you look like you need more sleep" March said seeing Erwin sweaty and tired in bed.
"Sleep is already what I need" The tired Erwin then answered "What do you want?"
March looking at Erwin realized and quickly said "Ohh...I wanted to tell you that our next destination is a delivery to the Herta Space Station."
"The Herta Space Station? what's that?"
March who heard Erwin's question answered "Well...their just a station full of researcher's while the owner of that space station is Madam Herta herself."
"Wake me up when we get there," Erwin wanting to sleep "And could you get me some coffee something not from Ms. Himeko."
"Why not Aunt Himeko's coffee"
Erwin then asked "First off why Aunt Himeko, and Second the coffee I saw from Ms. Himeko's table this morning was so black the moment I saw it I closed my mouth so tight that the aroma tingle's my nostrils."
"Oh come on its not that bad"
Erwin facing March with a side eye said "Why don't you try it and see for yourself."
"Never mind then just go back to sleep ill ask Pom-pom to wake you up" March nervously said.
After March said that Erwin slept face up and snored with March turning off the light's in the bedroom said rest well closed the door and to inform Pom-pom to wake up Erwin when we are almost at the Herta Space Station.