I agree with you about Dean, but the narrative was setting him up to fail as well. It’s not like he got a nosebleed immediately after the trial, which wouldn’t have been unreasonable. He got it a few days after the fact, which indicates that the trials are going to be chronically bad for Sam’s well being. And while that might be true for anyone who took on the trials, we don’t see other people doing it- we just see Sam and that it’s hurting him. The placement of the nosebleed as the episode’s closer and its juxtaposition with so many affirmations that he’s fine frame it as a weakness, instead of as a reasonable side effect, and signify that maybe he can’t succeed after all. I have faith in Sam, and obviously we’ll get a lot more of the story, but this particular ending was again framing him as the “weak” brother (as he was the “weak” brother for giving into temptation with the demon blood, etc.), and that’s extremely frustrating.