[user104658]

Originally Posted by Niamh.

Ugh reading some youtube comments and people are complaining about how high Arya jumped being unrealistic.... in an episode with zombies, zombie giants, magic spells setting swords on fire, an amulet that keeps someone young and dragons ............but someone jumping high is too far fetched

Those are in-universe established possibilities though, whereas humans in GoT only have human abilities unless otherwise specified (such as magic) and Arya doesn't have super jumping abilities.

THAT SAID... I had just assumed that she jumped down from a higher point . She could even have vaulted off a random Wight that was standing there; or if you look just before in that scene (top down view before Theon charges) you can see that there are piles of the dead that Theon has killed... she could have done a running jump off of one of those .