[GAMEPLAY] Unit with barrier died to crit from normal attack which was half of unit total health.

At this moment you can see Aurelion Soul Lvl 2 with barrier (about 2k health total) dies to Zed crit from normal attack, which is shown as 1140 on the screen. The rest of enemy team is CCed by Lulu, so there were no other hits to him. Did attack bypass barrier and killed unit or it was a bug? That was the first time happened to me.