Yep, it's Paul, not Seth. Paul wants answers to question which Seth doesn't have to ask. It's a good thing the trigger event happened when he was a teenager. Had it happened after he grew up, someone would be in pieces. Thank God for teenage years.
The little McGonagall in my head is somewhat nonplussed. She didn't expect to find him in her office after he abruptly left the dining hall at breakfast. I don't think she expected his blunt explanation of why he prefers to talk to her instead of Slughorn, either. She's trying to retreat behind manners while sorting it all out--and she's realizing that manners are totally inadequate, as he's discussing an adult issue.
This will be intriguing to write, once I get home.