Eventually Logan would probably figure out that the Doctor wasn't human. He wasn't even a mutant. The Doctor was not of this world and if he did have a smell it would be some mixture of Father Christmas and Space Wizard.
"Well," the Doctor began gently and more slowly, "for a start you might try to look behind you."
Whatever long and winding road Logan rode in on was no longer so long and winding. Instead it weaved itself back into The City.