The thing about magic burst is that Dementors drain the target’s magic anyway. It’s entirely plausible that if a Dementor kills you, it sucks away your magic in the process, or at least enough of it to prevent a magic burst.
The thing about magic burst is that Dementors drain the target’s magic anyway. It’s entirely plausible that if a Dementor kills you, it sucks away your magic in the process, or at least enough of it to prevent a magic burst.