It's certainly a proper caption, because the "fighting" is very evident. I liked the centering and movement of the photo. Thanks for sharing the experience.
Those poles in the water look remind me of slalom poles on ski slopes. I wish you had more information on them. Great action shot, conveying all the emotion of the moment. The height of the poles makes me think maybe the water level is low, which might make the river more dangerous than usual. I hope you can sell this pic to a kayak manufacturing company, or maybe a helmet manufacturer.