"Oh, I see you've had your leg off"

Biker fails to notice missing leg - Courier Mail.

By itself, that headline is worthy of note, but then you read the actual article: "He felt excruciating pain, but did not notice that his right leg was missing until he stopped at the next junction, the paper quoted local police as saying."

Huh? Right leg, if the Japanese have their bikes set up as we do, is rear-wheel braking and, well, balance. Surely you'd notice something. Presumably he either doesn't use the rear brake a lot or didn't need to at that point. In fact, just cornering would reveal the loss of that foot anyway.

What was he on?

And did he fall over when he stopped?

Edit: Whoops, fixed the link.