Create a monster_osprey, set the target to a path_corner, set up a series of path_corners and point them properly.
Create a few path_corners with speeds lower than 400, make them blend, the center one between 2 400 speed path_corners should be 0.
Put a few monster_human_grunt's in the map, when they are killed the osprey will go to the path_corner with the 0 speed setting.