There's something wrong with Elite Troops doctrine? Anyway, this bug is something new to me. Surprised at the sight of and unmanned mortar capping my territory.
He's just trolling you. Did the mortar keep firing? That happens sometimes when AT guns get decrewed but don't "die".
I hope that Relic will take note of this bug and figure out how to fix it. I remember there was an un-recrewable 0 man MG bug in one of the SNF contender bouts between OMGPOP and VonIvan and it ended up hurting POP badly and probably cost him the game. That said, I think the bizarre behavior of some team weapons add to the "wtfomgbbq"-quality of COH. Ghost pak from COH1, anybody?