The dismount doesn't have to be the same as the mount, either - a basket catch backwards, or (very exciting) forwards, or putting the hands down and doing a forward roll with the assistance of a base could all be variations.
You should dismount, he said.
He leaned forward as he helped her dismount at the barn, rain rolling off the brim of his hat in a stream.
After the works were silenced, the ships moved in closer, with a view to dismount the Egyptian guns.
Further on they had a scuffle with certain " Arabians "; and at last, after successfully accomplishing the passage of the " rough and stony " road that led to Jerusalem, they were obliged to dismount before the gate of the city till they should receive license from the governor to enter.