[NatedogEZ]

sub EVENT_CAST_BEGIN {
	quest::settimer("stopcast", 1);
	
}

sub EVENT_TIMER {
	if ($timer eq "stopcast") {
		$client->InterruptSpell();
		$client->Message(335, "Stop casting..");
		quest::stoptimer("stopcast");
	}
}

One way to get it to work.. but shorter spell cast times might be an issue :p