I saw a wedding photog doing that same thing a couple weekends ago. Shooting a wide angle lens (don't know what) on a Nikon D2x (I think), and shooting the 70-200 F/2.8 L on a Canon 1D. It seems to me that would just make life twice as difficult and twice as expensive...
I am guessing he is carrying the nikon for the kid
Clearly he's just holding the Canon for his buddy that went off to the bathroom. Or he said he went off to the bathroom but he's really looking for a barber.
So I had to go back and look at his hair because I don't notice things like that.
He definitly has something going on on the back of his neck.....looks nasty.
Maybe someone tried to yank his camera when he had the strap around his neck?