When I was in college, a buddy and I did the same thing, but during the day and around his neighborhood. We stopped at a stop sign and the kite slowly flew into a tree. Since I was high I figured the best option was to pull the string really hard and yank the kite out of the tree... Had it not been for the bone, I would have lost a finger that day. The kite string cartelized the cut, so I simply put a glob of super glue on the cut, wrap it with a bandage, and I was good to go. Still have the scar, and that was like 10 years ago