The ostrich flailed, squawked, and vanished. Jack reined in his mount and proceeded carefully, and arrived at the lip of a trench. He hadn't the faintest idea where he was, but this trench looked like a big one. He nudged the horse forward, expecting it to balk, but it cheerfully set to work, planting its hooves carefully in the loose earth of the trench's sloping wall and picking its way down. Jack saw fresh ostrich prints in the muck on the bottom, and set the horse to trotting that direction.