That’s not correct. If the whistle hasn’t blown the play dead, which on this play it hadn’t, the quarterback can still attempt to get a free play by throwing the ball and a defender can still attempt to sack the quarterback. The whistle hadn’t blown, Sherman made contact with the ball so there is no penalty, whether…

Watch it again. Sherman went for the ball. In fact he touched the ball while it was still being held before the kicker did. There was no whistle on the offsides. If Sherman had not blocked the kick the Bills would have refused the offsides penalty and taken the three points.