You're right, these things happen so fast you don't even know it's happening 'til you're on your back in the street. Glad to hear you're OK, and the bikes not too bad off.
Make sure you check the bike carefully for damage. After my last serious crash I straightened the bars and rode away, and a block later the rear wheel jammed because the QR came loose. I was lucky that time that it didn't cause anything serious.
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"...perhaps the world needs a little more Canada" - Jean Chretian, 2003.