Three pressure plates puzzle mystery (spoilers!)
 

I think I lost an hour yesterday on trying to get this done in several ways, no dice.
Posted it on Steam (someone else also got stuck on it), noone solved it.

Location: Reapers Coast approx coordinates x170, y60

A pic where pressure plates are (location of possessed dwarven ambush).
https://s26.postimg.org/wovs6l855/image.jpg

One pressure plate is by the green ghost, another near Fane (left) and third is all way up. There is no fourth.

Anyone solved it?

I actually think those are pressure plates that cause the barrels near them to explode during that encounter.

Unless they are tied to the statue with a quest on the higher ground near there, but I kinda doubt it.

No, the statue quest above that area is easily solved:

I missed these pressure plates completely! Wish there was possible to go back to the first island - I just have fought the last battle and sailed out…