It's not that he gave up a run. It's that from every outing he had in this series, it was completely predictable. We freak out because he gave up 6 baserunners, 3-4 walks, multiple runs, blew a save, over his last 1 2/3 IP when other pitchers have not had these struggles. Bullpen roles are stupid in general, like you said. But Corey has no business pitching in a high leverage situation on a regular basis. Other than location, his stuff looked just as good as ever. The argument could be made that he should be used in low leverage situations but up 2 runs against the Mets is different than one run or a tie.