Can we stop for a moment and think about this single gif?
Loki’s delayed reaction then playing along and turning his head as if Jane’s blow actually affected him?
This is a god, being slapped by a mortal and she LITERALLY has no effect on him what so ever.
He DIDN’T have to move any, but he played it up ‘like oh Lady of Thor who is able to wound me, you are worthy’, only she’s not and you can even see it in Sif’s face that this is an outright MOCKERY of Thor and his choice in a woman.
This mortal thing does not hurt them, will be dead long before them have reached middle ages; (as there is no proof that the Golden Apples of Idunn have the same effects on mortals as it does on the gods).
Loki is mocking Jane, insulting Thor, and showing to Sif that she will never be good enough to be Thor’s actual wife ( which she is in both myth and comics) because Thor wants THIS weak frail mortal.
Finally someone’s said it.