Level : Ass RANK As you know, assassins are quiet often hired to kill some spellcasting maggot. Many assassins died in those attempts while maggot was unable to hit them and suddenly he used unfair mighty magic spell and ... you know what happened. It is assassin style of fight - to flee and not to stay in combat ( usually ;) ) and therefore they are not waiting for a spell or something when their opponent is missing them and they will rather flee than continue fighting. It is on/off skill - displayed in prompt with %aC as C.