I have played in some left 4 dead server and I have seen some plugin. Far as I remember when special infected die (witch,hunter,smoker) effect explosion happen its not like real explosion it have sound of explosion and some kind of yellow circle sprite ring happen. I am looking for that plugin if it exist.
I dont know how to call this effect, I am cs 1.6 scripter but this looks like RING effect in cs 1.6 (TE_BEAMCYLINDER)