The Master was turned into a weapon in the time war so maybe the Doctor was too.
The timelords force the doctor into the hurt doctor.
The hurt doctor does unspeakable acts. Without thinking of the consequences he unleashes "The moment"
It ends the war and somehow the hurt doctor is turned back to Mcgann
The 8th doctor still holds memories of the hurt doctor
Events happened and didn't happen at the same time
Badly wounded the returned 8th doctor regenerates properly into Ecchelston.
The timelords force the doctor into the hurt doctor.
The hurt doctor does unspeakable acts. Without thinking of the consequences he unleashes "The moment"
It ends the war and somehow the hurt doctor is turned back to Mcgann
The 8th doctor still holds memories of the hurt doctor
Events happened and didn't happen at the same time
Badly wounded the returned 8th doctor regenerates properly into Ecchelston.