When a double comes in, the idea is to take both, but it requires fast shooting.  When the second one makes a bee-line after the first shot, the ideal sound  to call him back or make him stop is something completely different.  I sometimes change from prey distress to jackal distress moments before switching from the hand-held light to the rifle-fitted light, but leave it on pause. This works well when I operate the calling system for someone else in the shooting chair.  But when I'm alone (like I usually am), there are neither enough time nor enough hands to fiddle with the CD player.  So I always position the caller in my mouth before shooting, and then stop the fleeing partner momentarily with a short, hard blow for a standing shot.  Try that!

    ....but this one was alone....