Check if player is hitting npc or slapper

Is it possible to check if player is hitting an pc or slapper? I want to prevent player from using command. I know i can just set permission and delete that later. But that is just too much hassle. Also, i dont wanna see my console setting and unsetting permission.

 

Is is possible?

 

use EntityDamageEvent (pmmp) or SlapperHitEvent (slapper) to check if the player is hitting a slapper npc

 

or he can use EntityDamageByEntityEvent for get / check damager (Player) & entity (SlapperHuman)

 

I tried doing that and already checked it using EntityDamageByEntityEvent but got stucked implementing slapper. I don't know to get class from another plugin.

 

Say i do this api = $this->getServer()->getPluginManager()->getPluginManager()->getPlugin("Slapper");
Can i call it just like this?
$this->getServer()->getPluginManager()->callEvent($event = new SlapperHitEvent($entity, $damager));