yep, your foot is also important to keep the bike upright when stationary, sounds silly, but a shoe with crappy grip, a bit of wet or oil, and you have a zero mph fall....probably not lethal! but can wreck a bike and you can crush your leg if you get it trapped.
And wear proper leathers, or other protective gear, always. I dont care how hot it is, wear the proper stuff.
call the hospital when ever he is freaking out so he can get a psych test done