There are so many-many ways to be injured, some permanently, or to die in the woods. Climbing a tree stand is just one of them. Machinery is another. I am glad your friend is OK and not permanently injured - except for his Pride. He is still pretty spry for being 70, to be the unlucky one to test-to-failure that tree stand, and to survive the experience. Give him our Best Regards for a swift recovery, then let some younger legs test the remainder of the tree stands for strength and security...also, give that man a vest-type safety harness system for his Birthday or Christmas so he can continue to be your hunting partner for many more years. Each of us is intrinsically allergic to gravity...