Wow...accidents happen, but 22% as uke?
I'm pretty strict about keeping the head
off the mat, both in forward/backward rolls
and when uke's on their back (i.e. end of
zagi kokyu ho/kokyu dosa). Actually, the head should never touch the mat (if you can, you can keep it off during the standard pins too).
I've seen one concussion from an uke collision, but that's all.
I'd be interested in hearing how these happen, and which style/type of practice they happen in.
Jun, you got concussion from an elbow on the head once, right? Is that a one off, or have you seen any more from your dojo?
Keep your heads,