path_corner_precise is a cousin of the path_corner which has extra features for controlling patrolling monsters. The first difference is that monsters heading for a path_corner_precise will attempt to stand exactly on the coordinates of the waypoint, rather than changing targets as soon as it is touched.
“wait” is supported for monsters on path_corner_precise. For positive “wait” the monster will pause at this waypoint for that many seconds. If “wait” is negative the monster will pause indefinitely. While paused at a waypoint, the monster will turn to face the “angle” set on the path_corner_precise.
The Tome of Preach 