It took Jaka a few minutes to get ready, which was a shocking thing to Eldrian. And naturally, Eldrian wouldn't let the opportunity to observe a mage in action slip. Even during their talk, Eldrian had been using mana sense constantly to try and figure out what Jaka was up to.
For the most part, Jaka had just been standing there, moving his hands and mumbling under his breath. Eldrian could faintly make out the words, but he had no idea what was up with the hand movements.
Thanks to mana sense, Eldrian didn't miss a thing on what Jaka was planning. While he might not be able to copy it, and he had no idea what would actually happen, the collection and arrangement of mana told him a great deal.
Around Jaka, at around a 2-meter radius, with him at the center, there was a bubble-like formation of mana. The mana here wasn't dense, in fact, it was truly thin just like the water of a bubble. However, all the natural elements were visible in this bubble.