I was solo in the "Fragmented one" Assasination and it seems I just can't collect the needed Murmur Eyes. What am I supposed to do? I mean after 30 Minutes I had 21 of 30 needed eyes and I think I'm playing the game wrong. Sure, I've got to destroy enemies that turn eyes or the vetriums red, but besides that? I can't figure out how to actively collect them. Any hints?