I guess him recovering the helmet and wheel is a possibility, not something I'd thought of. The guy looked pretty forelorn though. Don't think the puncture theory makes much sense.
He'd also have a lock with him he'd only locked the wheel up...
edit: Crop beat me to it up-thread.
@Scrabble started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
I guess him recovering the helmet and wheel is a possibility, not something I'd thought of. The guy looked pretty forelorn though. Don't think the puncture theory makes much sense.