>>14340234he wasn't carrying potions on him when he went to meet Voldemort in the Shrieking Shack (though he should have) most likely he had assumed if Voldy was going to kill him he would have used the Killing Curse which has no antithesis.
>>14340278>Remus and Sirius who couldn't escape the immediacy of Avada KedavraBellatrix didn't use Avada Kedavra on Sirius, her spell caught him dead in the chest and he fell through the veil to the other side
We never see how Remus and Tonks get killed