Clint does not at all speak Italian, but he is pretty good at deducing people's positions from sound, so as the man is cursing and giving orders, he fires off a shot in his direction, probably not as precise as he's used to, but close enough to hit they guy somewhere. As for whoever was being sent after him, Clint decided his cover was blown enough that he could risk leaning into the room to get a clear shot at him.