The end of that game is on McHale. He HAS to be running (or limping in his case) to the center of the court screaming for a timeout the moment he sees the transition slow up on that final drive.
Eh, it's a tough call. If it worked, people would probably go "McHale trusts Harden to make the play, and it worked."
It was an excellent no timeout call. Why let the defense settle? He's been hot all game, all series in fact, so he's coming in full confidence too. It just so happened that Curry timed the double team well and he bobbled the ball.
But how about the Splash Defense, eh?