*** I haven't seen the video (thanks to a computer in desperate need of updates) I'll watch the video when I get home. ***
But, I'm playing devil's advocate here for a moment (don't get me wrong, if Derrick and/or Bin actually aimed at the cat, they are complete idiots) but I do have to point out that it is extremely difficult to control a toboggan (or sled/crazy carpet/GT racer/tube/cookie sheet) once you get going. Several Canadian cities have actually banned tobogganing because of the injuries/accidents people suffer.
I've seen plenty of adults/kids getting wiped out by out of control toboggans. And these are people who are familiar with tobogganing, as many parts of Canada has snow 6 months of the year (or more). People suffer broken limbs or worse. In my city, an Australian fellow new to Canada hit a tree and died recently. (any hoo, the point is: controlling a toboggan isn't as easy as most people think)
If Bin purposely pushed Derrick towards the poor cat, would Derrick have been able to control the sled (cookie sheet... seriously?). I'm guessing it wasn't a huge hill, so he could've rolled off the sheet and hung on to it so it wouldn't continue towards the cat... Hmm.. the more I think about it, you're all probably right. Stupid move by Derrick and Bin.