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
4x2.66 GHz Xeons, XFX 4870 1 GB, 11 GB DDR2 RAM, Win7 Pro x64, 120 GB OCZ Vertex2 (MLC, Sandforce)
26" VIZIO 1920x1200, Logitech FF 3D Pro, CH pedals, Track IR4