You can assign only one event function to an entity and need to handle all events this function:

Code:
function EventHandler()
{
 switch (event_type)
  {
    case EVENT_IMPACT: // handle event impact 
      set(viol_damageproperty,VISIBLE);
      ...       return;
    case EVENT_DETECT: // handle event detect 
      you.skill12 = 0;
      ...       
      return;
  }

}

...
my.event = EventHandler;
...


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