I was afraid they scored too soon.
Purdue got a first down on the 6 with just over a minute and a half left. The color analyst (Todd Blackledge, I think) says "they may spike it here" as they're approaching the line with the clock temporarily stopped for the first down. Was he kidding? Why waste a down, even with no time outs, when you can easily hike your first and goal play with 1:25 left? And you have a passing offense.
Anyway, Ariz St. wisely calls the TO before the ball is hiked, in order to save time for their own drive. Purdue throws an incomplete pass on first down, and scores on second down with well over a minute left. Arizona St. then goes 80 yards in less than 30 seconds, using the same screen play against the max blitz that also worked for their previous TD.
Purdue gets back to midfield, has a Hail Mary knocked out of the end zone. Tough loss for them.