It's possible but it also is a good illustration of why it's important to try and establish a reasonable sequence of events. The tent was too tidy when the rescuers found it, apparently (they were two tents sewn together that were meant to accomodate 4 people each, remember), and the tent was secured well, and then they made their way slowly down the mountainside, where they started a fairly robust fire, ripped or cut a lot of branches off the trees, and dug out a den, with no evidence of fighting. Therefore, it would be a good idea to try and recreate what they did to see if those activities could account for the inuries. The "ravine 4" apparently fell into a crevasse type opening in the snow, and onto rocks that lined a creek. They may have been huddled together, with Luda in front, so that when they fell into the crevasse type feature, not only did she fall onto rocks but the other guys fell on top of her. The other 3 sustained varying degrees of injuries from this fall, but also possibly from securing the tent and ripping or cutting branches off the trees. I think Igor and Slobodin may have fought, since they have some consistent bruising on the knuckles, but that could have also been due to trying to punch ice off the sides of the tent. If they did fight, it likely would have occurred after the "two Yuris" died, and when that happened Zina might have become angry and started back to the tent. But they probably were really cold and tired at this time, so I wonder how much energy they would have had to fight at that point.