He twists as if he's going to follow Tony and lets himself take the blow Steve gives him, using the momentum to throw himself into a shoulder roll that conceals when he deactivates the earpiece so he can hear again. He has to be able to hear, in case of any other commands, any threat to Sharon, anything else that he'll need to react to.

It's not unlike running one of the training exercises the two of them had done, just a fraction slower than deadly, a scaled down version of their battles in D.C. Bucky snatches the shield from the air as Steve flings it at him and holds it in front of himself, then sweeps it back in a blow that bounces off the floor to catch him in the gut and follows up with another kick.

They have to make it look good, this murderous show for a murderous man. They have to buy Tony time.