Blazes are able to kill the player in one hit, dealing insane damage to heavily armored players with fire resistance potions on realms. The death message also seems buggy, as it doesn't say "Player was burnt to a crisp" or anything related to being killed by the blaze. It simply states "Player died." To recreate the bug, find a nether fortress in multiplayer, be in survival mode, with armor and fire resistance potions. Allow blazes to fire at you, making sure to keep high enough health where dying from them won't be possible. A blaze will eventually kill you with a single blow.