Dismiss working, if not in same room.

[Sithiel]

A stout pony walks in from somewhere.
Chestnut, a chestnut pony stops following you.
You dismiss Chestnut, a chestnut pony from your service.
Your pulse returns to normal.
A stout pony stops following you.

"Chestnut" was nowhere near when I tried to dismiss my other mount, but I ended dismissing him anyway. I don't know whether this is a bug or if the helpfile that states this should not happen is just out-dated