It would be nice if someone made multiple relays like
OnRelay1
OnRelay2
OnActivate - Self - FireRelay1North
OnPlayerTouch - Named Brick - FireRelay2Up
OnRelay1 would only pick up the relay from FireRelay1 and OnRelay2 would only pick up the relay from FireRelay2 and so on, maybe to about 4.
That or where you could give projectiles/relays variables.