[Lamby]

I'm on the side of Lamby on this one.

If part of his RP is deception and playing the role of a thief then the act of telling another player to hand over a blessed item is part of this deception. The player should be skeptical of Lamby and not hand over the item. By the GM intervening we are basically saying that players shouldn't worry about being deceived in game because a GM will protect them.

This is how players gain their reputation. Lamby wants to have a reputation as a manipulative thief. His guild name (Bandits) announces this. He should thus be allowed to pursue this and players should be wary of him.

btw in game my character considers Lamby an enemy because he killed me while i was afk training taming.

See, John Falstaff gets it exactly cause he is someone who knows about and is trying to improve RP here...
(And I killed you macroing afk while you were exploiting a bug... Not very virtuous of you Mr. Falstaff)
0_o