I think Matt's mistake was pushing Strasburg out for the 8th. That was the time to go to Storen and see if he could throw strikes. Strasburg had a great game, but he is still not 100% and hasn't pitched deep into a game in a while. Of course had he gone this route, and Storen got rocked, then he'd be attacked for not sticking with Strasburg.
Unfortunately, Storen was arguably the best of the bad options for the 8th. Nobody in this bullpen is showing any ability to get people out (other than Papelbon and he's now allowed runs in his last two appearances).