It seems more plausible, that those frames are not edited, and are the result of damaged film. I am not sure what are the technical capabilities of the Zorky (if I remember correctly) camera to make photos during the night with no additional source of light. The moon was 42% visible during the night of 1st of February, which is hardly a good source of light IMO.
I am not a psychologist either, but I can hardly imagine, that any of the Dyatlov group took time to make photos after the start of the event, that forced them to leave the tent and eventually led to their demise. I think they had other priorities by that time.