There’s an abrupt scene change, after which Harry is sitting in McGonagall’s office. Now, his conversation with McGonagall is evidence for Harry being dim about that question (which is not that unlikely) or it being foreshadowing, possibly for this (which is not that unlikely). (McGonagall would also have to not point out “hey, maybe it was that you forgot my rule”, which makes the first somewhat less likely.)
There’s an abrupt scene change, after which Harry is sitting in McGonagall’s office. Now, his conversation with McGonagall is evidence for Harry being dim about that question (which is not that unlikely) or it being foreshadowing, possibly for this (which is not that unlikely). (McGonagall would also have to not point out “hey, maybe it was that you forgot my rule”, which makes the first somewhat less likely.)