Sage dismounts his pony and ties it up. He gets the attention of one of the coral workers and says, "If my horse disappears in a few hours or so, don't be alarmed or anything. It just means the spell's time is up."
He raises an eyebrow as he watches Edgar cast his spell.
SpoilerTaking ten on a spellcraft check results in a 19 for me. If you don't allow take 10s on spellcraft, I'll edit this with a roll later.