I didn't get a photo of the actual helmet involved.
But online I found the attached Rawa pic.
This is of a more recent version with a tab to quick release the chin cup. But one can still see the metal hook at the bottom of the adjuster. Seems that it might have been slightly longer on the one in the incident.
P.S. - yet the metal is very small, and hard to see even on the closeup of the chin cup area
(This post was edited by pchapman on May 4, 2009, 1:52 PM)