Its funny. If it wasn't the best skiers in the world they would be flamed for wide stance, bouncing up and down, skidding, rotating, bad pole plants, banking....etc.... you name it. The thing is that most people couldn't ski at all in conditions like that. Even so called good skiers. You definitely need good pist skis with tuned edges. In the St Anton for example they had the DH/SG course closed 3 days after WC and FIS races for the track to soften down a couple of years ago when I was there. I have a video clip of me skiing down one section of the track. Awful, I will definitely not post it here hahaa. Also, at some of our races we have had injected snow and I've come across it on WC/FIS training tracks. What's most striking IMO is that its very very hard. Like skiing in a hockey rink. However, sometimes its surface is softer. It all depends on the temperatures and how much water there is on the surface.
What comes to Marlis, she definitely skis faster and arcs her turns while the others are skidding sideways. I think its also an intent thing. They had different stuff they tried out. Marlis was closer to the way she performs in a race. The others maybe just tried to get a feel for how grippy the surface was over the streach they skied over. Who knows. The video was lagging quite a bit on my screen.