After this appeared the owner of bots, he got really angry and tried to change the farm tactics. He tried to interfere in my friends mob hunting by giving him trade. This way we got an info, that trade holds you from attacking until it's finished or cancelled.
So we used this same tactic against him and I think he got more angry then before and changed his farm tactic more by changing 1 mage to 1 archer. This way with archers instant skills he could get all the mobs to himself.
I came there too and when my friend was holding all the archers attention I used all the new tricks just steal the mobs from his mage. Then He changed his tactics again - put the mage on the spawn place of 2 mobs and made him cast blizzard all the time.