I fly a taildragger, I take an instructor in the right seat who does not have a tailwheel ticket. He gives me some instruction in instrument flying with a hood over my head. I allow him to land the aircraft, which he does perfectly safely.
He cannot be PIC as he is not qualified on type, and therefore he is not qualified to instruct in this case. I cannot log Put as I don't have a qualified instructor. He cannot log Put for the landing as I am not an instructor.
Who logs what?
Just for the record, and for the avoidance of doubt, it was fun, we both enjoyed it.
I logged P1, he logged nothing.