dbx12

The upstairs enemy would’ve attacked the player taking this photograph already, so we would know what happened here.

It could be an instance of “how do you do, fellow kids?”

Wanting to fit in but not knowing how to do it right.

I think endermen cannot teleport onto carpet. Unless the room is three blocks high.

There is no zombie nor spider close by, the environment seems intact. So the only possible confusion is this was the deed of a skeleton.