You could see the offensive rebound coming, if you looked close enough.
The Celtics spent most of the fourth quarter playing not to lose after building a 14-point lead with plenty of time remaining. The Bucks were trying to rally. That was the first sign of a problem.
Giannis Antetokounmpo had already made a 3-pointer, and the Celtics were willing to let him shoot. That was a second.
But the brightest blinking sign, of course, were the offensive rebounds. The Bucks finished Game 5 with 17, and the big one — of course — was Bobby Portis, who happened to be in the right place at the right time when Giannis Antetokounmpo missed a crucial free throw.