What kind of rule set is that?
Sickening story, by the way...forget that a medieval crossbow was used- this man killed his FATHER. Here's the quote that stuck with me though:
"It's shocking," said Troy Ross, 39, who lives across the street from the library and often takes his children there. "You don't think of a crossbow as something for killing people, just as something for recreation."
Really? Really?
Another sickening story, this one is worse:
http://www.washingtonpost.com/wp-dyn/content/article/2010/11/30/AR2010113006755.html