When you sit in the FM, you cover the NPC, expecially if it is a small race NPC. Humans Dwaves, Goblins, Gnomes, Undead etc are dwarfed by nelfs and taurens and orcs etc.
Heck, if i stand on a human FM, the FM is gone, there is only me.
Someone trying to click on the FM, especially a gnome, has a real good probability of clicking you instead, and since you have to RIGHT CLICK the FM, which is also the ATTACK function, suddenly you hit the guy sitting on the FM.
He of course does not move or retaliate, so the guards come over
and beat the bejesus out of the guy who was just trying to get a flight out of town.
The OP knows what he is doing, he is doing it on purpose, he is trying to get people whacked by the guards.
Anything else he says is just him jerking your chain.