hockeyman: Indeed, safety belts have been added to the B&M stand-up coasters (too-short safety belts, in my personal opinion...) Mantis being the first to get them. But until last season, the B&M stand-ups did not have safety belts.
Camel: If I remember news reports correctly, I thought the guy slipped out and exited the moving train, striking the maintenance catwalk on his way out. I don't have any more detail than that. But having ridden a couple of Togo stand-ups (King Cobra at Kings Island and Skyrider at Canada's Wonderland) I can tell you there is absolutely no way to 'accidently' come out of that restraint if you ever got your arms into it to begin with...
--Dave Althoff, Jr.