Walking long distances is easier as a wolf, though the men's horses don't appreciate it. When they finally stop and make camp for the evening Arya transforms back and walks over to Mai, ignoring the guards and bannermen as if they weren't there. "Have you had a chance to look over the tomes we found? Perhaps they're written in a language that the gem will let you read."
SpoilerAnyone interested in trying to crack open those tomes?