What Adam had displayed in that battle was amazing and, just like he expected, they had many questions they wanted to ask him, but some of them Adam couldn't truthfully answer yet.
The truth of the matter was that Adam was able to pull off impossible feats and couldn't be understood using common sense or what they had learnt and seen so far.
They didn't even see him pant or wince the entire time, despite how intense the battle was and how many times they managed to land attacks on him.
While he also seemed to still be able to fight after the spar ended and he didn't seem nearly as fatigued as them, despite having to face multiple opponents.
When thinking about it, their cultivation level was very similar to that of his and may have even slightly passed his, and yet he was still so much ahead of them.