It wasn't by design either, the actor was too short. Now in a scene like this where they need to make somebody appear taller, they use an item that looks like a claw? They could have even done a different camera angle and not even show the legs at all, but a claw would suffice.
What's the context of the clip??
How do we not know if there was a scene before that showing him walk up and place his foot on something in order to peer over the wall???
It looks weird to you so you immediately say "insectoid claw".
What kind of sense does that make????