Alot of the time, players knock monsters into other players. That is not very helpful, because you want to be able to predict where the enemy is going to attack in order to be able to dodge that attack. If a player starts attacking that monster into or out of the range of another player's weapon, then that is incredibly annoying.
It isn't a bad thing. Sometimes it happens to me, too. Mostly in Jelly Palace. But especially newer players may be totally unaware of that and therefore i am writing it down.