If it was a typical cargo van with no windows on the side, he was a fool. Could have been people in the back that would have got him when he opened the door or at least alerted the guys inside the house.
If I think someone is robbing my house while I'm in it, I'm gonna run like hell if I can. I'll make a stand if I have to, but not too far from me a couple came home to find some burglars and it turned into hostage situation. One of the bad guys had an AK-47. It lasted until 5am and some SWAT guys were injured when the house went up in flames before it all ended. They had to jump from the second floor.