A jumble of climbing teams crossing each other while others are rappelling. A helmet is highly recommended.

不同攀爬团队混杂的通过保护点或利用保护点下降，强烈推荐佩戴头盔。

And he had PTSD and also a fear of heights, because in Vietnam, he had been rappelling backwards out of helicopters over the skids.

他有战后创伤症候群并且他还恐高，因为在越南，他经常从直升机上反向绕绳下降。