So, clearly Sasuke had just needed a little encouragement.

The punch he was expecting, because there is no other response from Sasuke than that, and it's totally warranted, but it still hurts when it lands.

The foot however, isn't something he'd planned for. It catches him out, but he manages to stay upright... once he staggers back a few steps to balance himself out.

Having distance between them would probably prompt anyone else to start talking again, but he flies back at Sasuke, fist raised and ready to thump him in the side of the head.