三人行，必有我师(焉)

Or discussing limits to his powers - what exactly he can do with any given power he knows.
I suspect this is wrong on my part, but I also feel like, because Shen Wei's specific powers are by definition learned skills, he should use 能 for his basic power and 会 for what he picked up with it--沈巍他能学习能量，然后会用学过的能量？？？。