If i run dungeons which i rarely do because of people like this i'm normally the leader and if someone needs on something that isnt their armor class ie bh needing on strength gear i give them one chance and if they do it again they are kicked if you need something another player in the group needs for your companion you are kicked from my group and blacklisted, Players take priority over companions.
Yeah my companion is important and i *********** love doctor lokin but i give him my old gear once i upgrade but i would never do something as stupid or greedy as to need a piece of loot to gear one of my other companions when a player needs it. And if i'm not the leader that leader is given an ultimatum to kick the person who did it or lose my respect and the respect of my guild and i leave.