I was helping signing on, so I only got a 15 min warm up, but after 10 mins of the race, my legs felt good and I was holding position at fourth wheel in the bunch. The race had been shortened to 45 mins (because of the conditions - icy and we could only use the top circuit - 0.5 km).
Then I went down, I don't know how and had to be helped up (I don't remember this at all).
The image above is the resulting facial injuries, and I have road rash pretty much everywhere else. The powermeter files show I was going about 40km/h when I crashed.
Today, I sorted out my bike and found that the front tyre was flat, and think that this could have caused the fall, here is the stone in my tyre:
I reckon it will mean a week or two of the bike, but at least nothing on me was broken!
I will need to improve my training after two weeks off and sort out a new plan.
More on that soon.

