Did Cavendish Knock Veelers? Or did Veelers Block Cavendish?

Did Cavendish knock Veelers in stage 10? Who was right? Cavendish for getting him out of the way: Or Veelers for sitting up in the rush up to the line?

You can see for yourself by checking out the multiple videos on YouTube. Here is one, http://www.youtube.com/watch?v=LlBWnTPwmgI