I can't say I've ever seen a team just give up the way the Cavs did. Down by 9 with about 50 seconds left, the straits are dire, but not hopeless. Its the NBA, weird things can happen. Get a steal, hit a couple 3 pointers, I've seen it happen.
But they just ..... gave up. Its a deciding game. If you lose your season is over. You had the best record in the NBA, you're the #1 seed. Do anything, try everything, battle to the buzzer. But no. Bizarre.