Trigger help!

[the_playa6916]

I'm trying to make a trigger that will disable fog of war at the postion of a certain unit, then come back in 6 seconds.

The revealing part works fine, but for some reason the fog of war never comes back, and this is a big problem: I dont no how to disable Visibility Modifiers... Here is my trigger:

(1st trigger to enable visibility)

EVENT
[ no event, since another trigger already makes this trigger run]

CONDITIONS
(number of players in PGTeam1) - (Number of players in PGDead1) = 1

ACTION
Player group- Pick every player in (All players) and do (visibility- Create an initially enabled Visibility Modifier for (picked player) emitting Visibility from (Position of (random unit owned by Player 1 (red)) to a radius of 512.)

Countown timer- Set TMRVisMod as a one-shot countdown timer that will expire in 6 seconds

{that part works fine, but this next part is the problem}

EVENT
Timer- TMRVisMod Expires

CONDITIONS

ACTIONS

Visibility - Disable (last created visibility modifier)
[ there are no other visibility modifiers that i created]

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CAN anyone help?!?!