Originally Posted by Bacciagalupe

Tire blow-outs are very loud; if the tire blew before the crash, even with the iPod you would've heard it. You probably would've felt a flat early as well.

Also, I don't think a flat tire would cause the front wheel to go sideways. More likely is that while you were paying attention to the rear wheel, you hit something that turned the wheel. The tire could've gone flat at any time after the crash, too. Another possibility is that the front QR's may have been loose.

Unfortunately, some crashes simply cannot be avoided....