snail perk help

function give_snail_perk()
{
	self.has_snail_perk = true;
	// other shader stuff and stuff to match his tutorial here
	self thread check_for_close_zoms();
}

function check_for_close_zoms()
{
	while(self.has_snail_perk)
	{
		zoms = GetAISpeciesArray( "axis", "all" );
		zoms = util::get_array_of_closest( self.origin, zoms , undefined , undefined, 150 ); // 150 is the max distance. take a look at this function in util.gsc to edit stuff
		foreach( zom in zoms )
		{
			if( !isDefined( zom.is_snailed )
				zom thread warp_time();
		}
		wait(0.05);
	}
}

function warp_time()
{
	self.is_snailed = true;
	self ASMSetAnimationRate(0.5);
	self SetMoveSpeedScale(.1);
	wait(3); // this is how long it will be slowed
	self.is_snailed = undefined;
	self ASMSetAnimationRate(1);
	self SetMoveSpeedScale(1);
}

function take_snail_perk()
{
	self.has_snail_perk = false;
	// other stuff here
}