Stop before you hit the wall!

It's Twisted sketch time again for me- go look for the sketch here- the twist is stop. It may be a little hard to tell from this picture but Arthur is ploughing into a wall at the bottom of an artificial sledging slope. It was on his school trip and I was trying to get a picture of him in action down the slope but all I have is pictures of him about to impact into a hard wooden crash barrier!