A man , protected by a helmet and other protective gear , is battling his way down rough rapids in a red one-man kayak .
It is probably the case that the man is on a very rough part of the river , near a waterfall .
We doubt that the man is on a very rough part of the river , near a waterfall .
It is probably the case that the man is on a very rough part of the river , near a waterfall .
The man is on a very rough part of the river , near a waterfall .