Forcing Enemies to Run from Specific Weapons

[[name_withheld]]

I want the enemies to run when I come near them (or they see me, i guess,) with the chainsaw. There's an example on the zDooM wiki that shows how to use A_ChangeFlag and A_JumpIfInTargetInventory to change a monster's +FRIGHTENED flag from within the monster's own coding. However, that would require modifying code for a LOT of enemies I plan on using.

 

Is there a way to achieve this same effect universally from within the coding of the chainsaw itself? I'm using decorate. Thanks in advance to anyone who may be able to help!

[SilverMiner]

https://zdoom.org/wiki/Classes:PowerFrightener

Define and try giving the player this^ kind of powerup when the weapon is raising when chosen, and taking the powerup when it's being lowered