[He doesn't have room to move. There's nowhere to move to, so that one lands. He grits his teeth against the scream, but he can't suppress the shudder that comes after. It's not like he didn't know his objective could be unpleasant. He just hadn't really thought of it. It hadn't really come into play, outside of safe situations.

This isn't safe. This is the opposite of cozy and pleasant, so the reward for pain is anything but welcome. He needs to escape now. Maybe if he gets a knee to Shirou's groin?]