Here is some code on what I think you needed, if you need more or didn't like this I would be glad to do another for you, and I would make it more realistic. Also if you do need more posting a link to a video of what you want would be helpful
Hope this helps,
RavenOfCode
Stuff + Other Stuff + Different Other Stuff = Things :)
My best Alice game:
Clash of the Cubes (an arena fighting game):
http://www.alice.org/community/showthread.php?t=10738&highlight=game