This has to be a bug right? Insta killed no DMG by nothing!

Soo this happened on stream today. Killed everything fin shed the map. Then running about and I get 1 shot instant with no DMG taking. Just complete deletion from a magical appearing ice patch. No enemies no cause. And again no DMG just complete full health to 0 on max reses to nothing! https://www.twitch.tv/colonelgohard/clip/ResoluteGoodYamSpicyBoy-Z2ozdvceHTIKxxxk