From SRB2 Wiki
A_FaceTarget is an action that immediately changes the actor's angle to be facing its target. If the actor doesn't have a target however, this action will do nothing. In SRB2, this is frequently used by a number of Objects and other actions.
|Actions – Utility||[view]|
|A_ArrowCheck • A_CheckBuddy • A_FaceTarget • A_FaceTracer • A_InfoState • A_Repeat|