Guild Wars 2

It took me bout an hour to get to the very top (I guess), but I can’t find the way further. Unfortunately I was kicked to the hub by some reason, so no screenshot. Here I am stuck: might be a spoiler for someoneon the high "towers" with jumping sheeps, where the blizzard reduces the ditance of vision, there' s a checkpoint. After checkpoint, there're 3 polar bears, I killed 'em. But I have no clue where to go after this, nowhere to go from that platform. On the left side it looks like there's a closed aperture, but usually they're opened from the inside, and I can't see the way in, so...
As there’re tips on fighting the boss already, I guess quite a few people already made this part.

I took a good 30 minutes to get past this. Starting from the checkpoint, cross the gap where the polar bears were and go left, to the back of the platform. There are clouds for you to jump on.

Thank you, finished Zone 3!
I should have been blind to not see that cloud =\