James only holds back the extra supernatural strength and speed as much as he can. It will still seem a bit inhuman, the levels, the speed, the strength, the way he doesn't even wince when she gives him that powerful roundhouse to his shoulder. He is impressed already though, meeting each hit, blocking, throwing in hits of his own in her direction. The way he spars shows he takes her seriously, recognizes how good she is. There is an intensity and focus to it.

When they finish, he is sweaty and a bit breathless, and there's a soft smirk on his face. "...you're really good." She is impressively good. "I'm James."