Dear Lord. Prayers for this man.
Details at this link:
http://www.delawareonline.com/story/news/local/2016/11/06/injury-punkin-chunkin-sends-one-hospital/93394698/
Some of those air cannons use recycled propane and other pressure tanks for reservoirs. Improper welding can weaken those things.
Prayers up!
God grant him strength.
Agreeing in prayer for this man and his family. Amen