Given the volume of indirect fire, area of denial fire, and mines, I would guess that the biggest thing that set him apart from the dead and wounded was mostly the same thing that set everyone else who walked off that beach apart from them: They weren't overly unlucky?
I've never seen anything to suggest that photographers were given any more consideration on either side of the line than medics, and honestly I can't recall any period source suggesting photographers even specifically had the level of acknowledgement and expected protection that medics were supposed to have been given.
Then and now, keeping your head down and not drawing attention to yourself while in a war zone has been generally considered a good idea. The fact that he lived through things would suggest that he probably had a good understanding of the difference between cover and concealment, and wasn't overly prone to doing exceedingly foolish things. Exactly how 'foolish' it is to spend part of your life wandering around active battlefields holding just a camera is itself its own lengthy debate I think.
If you're seen while moving up and down an active line of fire during a battle then odds are someone on the other side is likely to try shooting at you before they stop to think "What's that guy holding". At 200 yards and behind some tall grass, the visual difference between a box of ammo and a camera isn't something that many are going to care about.
In modern conflict, the value of clearly distinguishing press from combat personnel is debated. - The journalist probably doesn't have much in the way of combat skills so they're an easy target, they might make a good hostage or source of intel if captured (Which is easier to do thanks to point 1), and wounding them potentially serves as something to tie up more resources than a normal soldier with western forces because getting your embedded journalist killed tends to generate rather bad press.