I don't see any abuse here. The ban reason is level boost. One of them was using the hitman skill to boost level. the player asks another player to let kill him after placing him in the hit list to gain a level. and that shit was repeating. that's why they got banned. it's unfair to boost level by such way
For clear what happened , i will repeat this , both of them were working together to farming scores each other by placing hit and kill then repeat with the same thing , understand ?