According to one of the ch7 guys, (online article comment) the cameraman once clear tried to go back but was stopped by police.
Give the guy a break, natural instinct is to get out, he is a cameraman not a flight attendant!
Did make me wonder though, seemed quite difficult for the pilot to get the door open, (quite a heaught I suppose) is there not any kind of quick release mechanisms on the doors to get them off in a hurry if needed? He was swinging it a bit before he got it open.