EVENT_COMBAT Glitch?

[Angelox]

FatherNitwit: added EVENT_COMBAT triggered when an NPC engages any form of
FatherNitwit: combat and when combat is over. $combat_state signals which.

Here's a simple pl I plan for the guards;

#npc - Gfaydark Guard Protectors
#zone - Gfaydark

sub EVENT_COMBAT {
   quest::say("For the defense of Kelethin!!");
   quest::say("For the protection of all Fier'Dal, there shall be no mercy for your kind.");
  }

This works fine but, I noticed, when the aggro wears off, the NPC repeats the text again; Anotherwords, he sees the mob, chants his text, kills the mob - then a few seconds later he settles down, re-chants the text , and walks back to where he was.
I wonder if this is just something needs to be fixed, or there's a way to get him not to repeat himself?