Two minors were reportedly hiking off-trail in Green Canyon Monday and used a large knife to cut through the brush. At one point, they lost the knife. While trying to find it, the minors slid down a hill on their backsides.

The Cache County Sheriff's Office reports one of the minors slid onto the knife, causing significant injuries.
https://kutv.com/news/local/knife-injured-youth-flown-to-hospital-after-rescue-in-green-canyon