The other way you could look at the PH decision: You let Young hit, if he gets on base, 1 out, 2 on, you could let Shaw hit and put in Papi for Vazquez. Sure you run the risk of possibly a DP and not get Papi in the game. On the other hand, you give yourself the opportunity to get 2 hot bats and a solid bat instead of 1 hot bat, 1 solid, and a black hole.
You are on the road, don't sell out a multiple runs inning and a stronger string of bats for an at best slightly better chance for the 1 tying run.