Sometimes, when a player is "just standing there" there's a reason for it. On the play when he was getting ripped for standing still, it looked to me like UConn was trying to get into some sort of a set for a quick-hitting play, where Lamb was waiting for the ball to reverse to the opposite site before making a cut (either along the baseline or a flash to the paint - who knows) towards the ball. Syracuse overplayed that passing lane, and UConn never reversed the ball, and Napier took a long three rather than kill any more clock.
Lamb really had nowhere to cut, since he was in the corner on the strong side and all he would have done would have been to bring his man into any potential driving lanes. I don't know if he kept standing after the shot went up - you could fault him for that if he did, but the whole possession was just what Bill Simmons would call a clogged toilet.