#WhenGrindelwald traveled back and forth and became Harry Potter
There was an explosion in Little Whinging, and Harry's magic burst and destroyed half the house. After hearing the news, Dumbledore immediately came to erase the memory of the Darthri couple.
Dumbledore, who thought he had taken care of everything, turned around and left, but he didn't expect that Harry after the explosion was no longer the same Harry.
Cp: HPAD, given that GGAD is impossible to HE.
PS: Here ggad means that you regard the other person as your most important person mentally and will not do anything out of the ordinary. Given that GG is now wearing the cloak of HP, and HP and AD are nearly 100 years apart...