What exactly am I supposed to be doing in the final fight with the king of shadows?

Jerro shouts that the statues are important, and they have a shadow around them, yet I am unable to interact with them and killing off the mini king of shadows doesnt appear to be doing anything.

What am I supposed to do?


Also what was I supposed to do for the fight against Black Garius? I couldnt get past the forcefields in that one (it seems like I was supposed to do something with the statues there too, but again wasnt able to, ended up spamming fire arrows at him).