It seems unlikely that those photos are what Jon was going to sue over. Even if he could sue for "make him give back all his photos of me," he'd have to be very specific to avoid Bruce saying "OK, fine, I didn't realize it mattered, here they are" and give him only half the photos. Or even go into court and "I want a witness that I'm returning these. Please inspect these photos, Your Honor."

That's separate from the fact that if, almost certainly, these are digital photos, there's no equivalent of demanding the negatives.