According to the Tuck Rule, the quarterback can, upon receiving the ball, fake a throw and, even if the play goes on a full 30 minutes, can never be charged with a fumble.
Just because some people didn't know it was there, doesn't mean it was the wrong call. What would you have had them do? Say "Well, even though it's a game rule, we're gonna call it a fumble because it wouldn't be fair if we followed the NFL rules?" I mean, what the hell?