Cheating or bug abusing?

There was a guy named Loki#110585 on my game and “Upper Hand” tavern spell triggered twice. Normally you can use one at a time and that guy hit me 20 damage while I have 26 hp and suddenly I died after combat.Is this guy cheating or is it a weird different bugs happened same time?

Please don’t post the BattleNet tags of other players on the forum. That’s against the rules.