Players reviving themself?

Saw a guy that cosplayed Deadpool by reviving himself (clip). I was wondering if it was a known bug abuse or a rare situation.

Guy told me he didn't know how that happened. Cheat or not, in my book, the way he kept playing with it is still a bug abuse.

Let me know if you saw someone like that once. Would be a good way to try reverse engineer that and QA the problematic.