Love the total confirmation of the thesis that these guys skied UPHILL, and then DOWNHILL to outrun their game.
I saw it as a depiction of back and forth, drawn on a wall.
The bear goes up the mountain, then he comes down the mountain. You don't just walk over and spear the bear ~ you must catch him by surprise.
First you ski up (short strokes) then you ski down (long strokes ~ you go further for a given effort when going down hill.
Then, you get below the bear, who is running down hill and can't stop on the snow and he impales himself on your spear.