They went up by as many as 15 points with just under 11 minutes left to play.
He went to the bench with 16 minutes 33 seconds remaining and did not return.
He was gone, with five minutes leeway before the blast would strike.
He went to the locker room with eight minutes left in the game.
So he went to a trapping defense with 11 minutes to play in the first half.
That lead twice went to 10 points, at 59-49 and 68-58, with slightly less than two minutes left.
Cassell went down tonight with 10 minutes 1 second left in the game and did not return.
Switzer elected to go for a first down on a fourth-and-1 play from his own 29-yard line with two minutes left.
Georgetown (10-0) went ahead by 28-10 with 7 minutes 34 seconds left in the first half.
They went even closer with 15 minutes to go.