My contention is that when the hikers levelled the base for their tent,they cut through a layer dividing two layers of snow . When the overburden became too great from additional snow deposition and ground level wind, the upper slab let loose, covering the tent. The hikers cut their way out. Next comes a decision. I reason that clearing the tent might release even more slab on the 30 degree slope. Additionally, once they were out of the tent, did they actually have a choice to return to it? A cut tent is not a warm tent and the slide that caught them the first time could certainly continue to cascade down on them.
Arguably, even if they did excavate snow to retrieve supplies, perhaps the idea emerged that a second slide would obliterate the tent completely and they would never find it. Certainly, they are not going to have an easy time off getting to Vizhay on cached supplies only. Additionally, while they are digging, they are not making fire nor sheltering from any winds, up to hurricane force. The flashlight on the trail to the forest suggests they moved in darkness. This also reinforces the uncertainty of their circumstance. What I envision is cold,,dark,and uncertainty about what Nature will throw at them next.Their strength lies in their free will to choose what they will do next.
Once they agree to leave the slope, there is no turning back. Why? Turning back does not change the circumstance of their departure. No, it is all about getting to the woods, making fire, getting out of the wind and attempting to mark the trail back to the tent and home. If indeed there was a regularly passing aircraft, they could lay out three lines of cutting in the snow.
As Sr. maldanado points out, time is of the essence. Stalling at the tent is just running the clock down. My guess is that there was no real discussion about leaving because their survival did not depend on remaining at the tent, but instead it depended in leaving it. Even at that, we know that each one of them started to shut down. My suspicion is that the weather did not abate. It was savage when they left for the woods, and savage in the woods.
In other discussions, there has been the hint that geologists had some indirect involvement with the disaster. Is it not curious that any testimony by geologists is wholly absent from the case?