qzdoom/wadsrc/static/actors/hexen/flies.txt

// Buzzy fly ----------------------------------------------------------------

ACTOR LittleFly
{
	+NOBLOCKMAP +NOGRAVITY
	+CANPASS
	
	Speed 6
	Radius 5
	Height 5
	Mass 2
	ActiveSound "FlyBuzz"
	
	action native A_FlySearch();
	action native A_FlyBuzz();
	
	States
	{
	Spawn:
		TNT1 A 20 A_FlySearch	// [RH] Invisible when not flying
		Loop
	Buzz:
		AFLY ABCD 3 A_FlyBuzz
		Loop
	}
}