I hate hearing about things like this.
It's really scary (and irresponsible) that he would do this - especially after you had specifically asked him not to. I hope I'm never unlucky enough to be in that situation (or jump with this guy) and I'm sad to see that one person can so thoughtlessly put the lives of others in danger.
Glad you all got out of it ok and hopefully this guy will have a wake up call - if not for himself then hopefully for everyone else around him.