[saalweachter]

... have you ever broken your ankle?

Walking -- running, even -- on a broken ankle is totally normal, for like fifteen minutes or an hour. It's after the swelling sets in that you get all hobbling mclimpy.

Having broken my own ankle I could totally believe that after the initial "ow, fuck, that hurt", Booth could totally have not realized he'd busted his ankle until he tried to get off his horse and his ankle went NOPE.