I know I will get spanked for this...

[rulesmaven]

I initially confused the three fingers for a fist and I too thought I heard a whistle. When I saw Burr slam it home, with the three fingers no longer there, my immediate reaction was that the call was a two point basket and a foul. In fact, I turned to my wife, and said, "wow, big pressure free throw here." It was the absence of a touchdown and the slamming it home, plus the apparent whistle that confused me. On tivo, replaying it, it was clear there is no fist, which makes the whole debate silly, although there is something that sounds like a whistle.

Why did Burr slam it home? To signal that the shot was released before the expiration of the game, I guess. On the replay, I didn't see any foul, other than perhaps P/C.