Seen anyone teleport?

I was playing a few rounds of Casual Breakthrough tonight leveling up a rifle. I noticed on two maps in a row a certain player would come from behind in what seemed like impossible places. I was like dang, he’s one sneaky bastard.

But, then I was defense on Blackwell Fields. I started behind the garage. Immediately went to the roof. The guy was already on the roof in front of the AC unit (like facing us with back toward allies) with an LMG laying waste to the bots, got me two as I stood there like wtf.

I reported him. Hadn’t seen that before, wondering if anyone else has.