A sound suggesting an approaching avalanche could lead to the panic you mention. Plus, someone further up mentions the possibility of the tent door being frozen

A sound suggesting an approaching avalanche could lead to the panic you mention. Plus, someone further up mentions the possibility of the tent door being frozen or difficult to open. I think it's suggested that some might have taken clothes from those that froze to death, explaining those left naked. If some climbed trees and fell, or fell into a ravine, that could explain most of the injuries.