Well, as we all know friendly fire IS reality in any conflict. It has happened to me in every combat flight sim I've flown (not as many as some, but not a newbie either). I wouldn't be so concerned, because as you say, "you've never seen that before", though I know you mean the AI getting credit for 'damaging' one from their side...
So it isn't an AI issue per se (he thought he could take the shot! Oh well

) but a bug in career mode that gave him the credit for a friendly.
Sometimes you gotta laugh, otherwise you'd be crying

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