selecting players to ping for?

this is what i want to do, when a certain type of spells is cast, i want all the players to be pinged of where the spell was cast and and a game - text message will say, loud explosion heard!!

this would seem easy for me, but the thing is that the person casting it and the target should not get this message and ping since there are in the immediate vicinity and have heard/seen it

how would i select all the players that are not the caster and the target to display to?

Add all the players to a variable... something like pick all players [something that all have] and do add picked player to Variable (player group variable, i believe)

Remove owner of casting unit from Variable.

Ping All players in variable, etc.

because everytime a spell is cast it would have to pick and unpick players and this would happen quite often with the many spells,

this wouldnt cause any lag problems or conflicting problems if multiple spells are cast constantly would it? like if two spells were cast at about the same time, it would still work fine right?

EDIT: after testing it, is there a way to deselect in a range around the casting unit and then remove the owners of those? because a unit could be right on screen and not be the casting unit or the target and shouldnt be notified of the spell

Question , how do you ping for a player using triggers, I just can't seem to find it in the triggers. Sorry for bugging you guys.

Its part of the cinematic triggers. Next time just use the "search for text" function in the trigger editor.