Infrasound can cause weird psychological effects. Fractured bones can be caused by carelessly scrambling over uneven terrain which the campers may have done in terror. Vortex streets can also supposedly be composed of large vortices which are like tornadoes. Maybe the fractured bones could be explained by this as well. Missing eyes and tongues can be caused by wildlife.

Edited to remove snark

This article references one of my favorite anecdotes about infrasound and "hauntings": https://gizmodo.com/some-ghosts-may-be-sound-waves-just-belo...

It's early in, look for the part about Vic Tandy.

Are there any other records of infrasound making people panic like this while camping in the mountains?