Similar scenario...A77 holds before the pass and then after the INT, grabs a facemask. Two fouls, same player.
If his blocking is extended and he makes an effort to 'protect his QB at all costs', one foul. If after the INT he makes an effort to get involved (even if he were to put his helmet back on), second foul. The helmet coming off is not the foul, it's his separate and distinct actions afterwards.
I'll leave my 2 Lincoln's on the table...