[manwe150]

I think that depends what you mean by legal request. The guy is not making a request of the legal system, so no, it is not specifically a legal request in that sense. However, if someone did make a legal request later, the testimony of this exchange might be introduced as evidence that they had a entered into a contractual agreement verbally to give the guy a right to have a copy of the photo for his private use. (Remember that the family also have a legal right to their own likeness, though it is a privacy law, not copyright, so there are multiple dimensions here as to who has the initial rights in the interaction). Replace "family" with "celebrity" and I think you'd have a plausible scenario that might end up in court on occasion.