I think Ed's insinuation that he will blow the roof off the house refers to what he plans to say in his goodbye message. I would guess that he plans to tell Tully to pull her head in and consider how she has disrespected her outside relationship, and tell Drew that he has no respect and has encouraged and effectively condoned "cheating" ... blah blah blah. Perhaps that kind of thing. But, what he says he is going to do, and what he may actually do, could turn out to be two entirely different things. Who knows?