projectile intercept problem on zdoom

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I'm trying to make enemies shoot Intercepted projectiles using Decorate in Slade, but this is as far as I can get with it. Here's the code that I've written:
actor ImpLead : DoomImp replaces DoomImp
{
States
{
Missile:
TROO EF 8 A_FaceTarget
TROO G 6 BRIGHT Thing_ProjectileIntercept (0, 10, 100, 1337, 30)
Goto See
}
}

1337 is the TID I set to the player.