The shot went into his left ear.
I haven't had very many missfires at all with .22 RF but I have had it happen often enough to know that it does happen from time to time. Rare enough that I forgot which brands they were except for a few of the Winchester Super-X that I've used several thousand of up until recently. I think that the ones I've had, other than the Velocitors, was due to too much crud build-up around the face of the bolt. It's ony this case that caught my attention because I had 3 out of 50.
To sum it up I'm going to try some more Velocitors and try and be more analytical when it happens if it does.
Thank you all for your replies.