I thought that was the plan in the beginning, it made sense to me as a blinded man and a woman with a broken leg will not be able to move either quickly or for a meaningful period of time. Both are in pain and once the shock wears off on the elf, he's going to be all but immobile. The horse is really the only option and it frees up one of the PC's for protection instead of having two caretaking them... If the mount will follow the short, pudgy guy, that frees up all 4 PC's.