2:1 ahead, suddenly 1:3 lost?

I just fought this guy, normal fight, everyone used skills within the time limit (not the normal attack when having a disconnect). I was 2:1 ahead when he puts the amagocephalus in. Firstborn he slowed but not much damage to mine, still over 2000 health. The he put his invulnerable shield up, countered the attack with something around 100 damage and then instantly I got the screen “defeat” 1:3 … is this a new kind of cheating?

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