He'd rather been expecting that punch, actually. He didn't duck. Didn't quite have time to tell where that punch was going to land, but he compensated and didn't go down.
He straightened up, eyes flashing. A little bit angry, a little bit amused, and a lot engaged. The Master had his full attention, and he was ready to fight, if need be. But a fight didn't have to be all bad. His hand automatically reaching into his pocket.
"Feel better?", he said grinning wolfishly. "Want to get another in? I can take it. " He whipped out his screwdriver. "Feel the need to do some more lasting damage and we could have ourselves a serious problem," he warned.