One person could stretch his legs at a time, and the man responsible was inside, trapped with the 4 victims, nasty business.
I think this whole thing is hilarious. It's not funny because they're rich. It's funny because this is uniquely absurd. A tin can deadbolted from the outside made from parts you can get at Home Depot or Ebay and an off market video game controller. He had more than enough money to do this safely but in his hubris he still cut corners. Fatal stupidity.
Billionaires don't always get to the "find out" part of the saying.