[MENTION=6805410]Fradak[/MENTION] Absolutely points for cool. That said, my main problem with the situation is the aspect of it being a chase scene. You have another raiding boat coming with all speed directly downriver. You can't walk on the bottom as fast as a boat can travel downriver at the top. (You probably have a hard enough time just keeping your footing. Heavy as you are, there's a lot of water pushing at you.)
So here's how it's going to be: you've got the boat by the anchor and can get it off the bank quickly, but you are going to eventually be pulled by the boat (and probably slow it down. You can 'jump' by lifting yourself on the anchor-rope and swinging with the current.
That's the situation at the beginning of the scene. Let's let everyone else catch up before we do any more.