Going for Dimitri head-on was, Caspar knows, maybe not the best strategy - he already knows he's got more sheer strength, and his horns, now that that's a factor, have grown in more too. But he made his choice, and now he's got to stick with it.

Even if "it" is a little like sprinting headfirst (hornfirst?) into a brick wall.

Since Dimitri hasn't used his hands-- neither will Caspar, for now. Instead, he pushes back against Dimitri for a moment - then sidesteps, turning his head as he does, hoping that the sudden lack of resistance may turn Dimitri's force against him, at least a bit.