The fight with the 7th year had the potential to end things in this way with Hermione as well, but it did not due to sheer luck. It would be poor planning on Snape’s part if he had wanted to help SPHEW in its fight. His presence at the last big fight is not evidence either way; he could have been there to bolster the slytherins or help SPHEW.
I think it was pretty clear that he was there to help SPHEW. That makes sense given his memory charming of everyone involved and it was (very) heavily implied that he was helping them in other battles.
I think it was pretty clear that he was there to help SPHEW. That makes sense given his memory charming of everyone involved and it was (very) heavily implied that he was helping them in other battles.
I notice I am confused.…
(I reread the Dumbledore conversation speculating that Quirrell was helping SPHEW in previous fights, and that can only be Snape helping.)
He could have memory-charmed if he didn’t want to be known as working against SPHEW, but it is more likely that he was helping.
Now I do not have a good theory for who H&C is.