A_Stop

From ZDoom Wiki

A_Stop

(no parameters)

This stops the actor's current movement by setting its acceleration and speed to 0. This can also be used on players, monsters and anything else that is moving vertically or horizontally.

Examples

actor SoulStopper : LostSoul
{
states
  Missile:
    SKUL C 10 bright A_FaceTarget
    SKUL D 4 bright A_SkullAttack
    SKUL CDCDCDC 4 bright
    SKUL C 0 A_Stop
    goto See
}
}

This Lost Soul flies through the air to attack but stops after a short distance. Without A_Stop it would return to it's See state while still flying towards it's target.