Guild Wars 2

I see, so I should stop trying to mindlessly jump on that specific platform and find another path?

I am now facing this cloud close to the end of W2 Z3 in Tribulation mode, it is covering the whole platform so I can’t jump anywhere on it.

http://imgur.com/Ha1qnHk
http://imgur.com/c85XEEg

What made me think it is a bug is that in this video, right after the 24:00 mark, the same cloud leaves quite a noticeable place, allowing the player to jump on the platform.

I have just completed Twilight Arbor on explorable mode doing the forward forward path, however, at the end we got no completion reward. Instead a weird red cog was switching places in the map in the place where the fight with Leurent’s elite takes place (The four archers in the bubbles).
Anyone experienced anything similar?