Last year my wife was in a serious bicycle accident. If she hadn't been wearing her helmet she probably would have been killed. As it was she was months recovering.
Best wishes to Blast for a speedy and full recovery.
Everybody else: don't ride your bike without a properly fitted, unexpired helmet.
Sorry to hear that.
Rule one of cycling (and this is twenty five years of cycling to and from work speaking): Assume that everyone else on the road hates you, and thinks you would look just peachy as a pancaked road kill.
So make a point of always being where it is difficult to get at you.
Rule two: Your the softest, sqishiest most invisable thing on the road. Always assume that they ain't seen you and be ready to get out of the way real quick.