I'll do some testing, personally didn't experience this but if it happened by complete coincidence then that's something I should definitely fix. What level are your party members at?
It's fine, really! Upon playtesting the currently in-progress version of the game with my party members at level 4 I didn't get the impression that such a thing was plausible, so I'm at least pretty sure that won't be as much of a possibility in the next build. Think you could go back and try the fight again, then let me know how it goes?