umbral infiltration super final blows is a badly thought out step because when you use your super the first part freezes enemies and the first enemy killed cause shatter damage on the rest of enemies WHICH does not count towards super final blows even though it is part of the nature of the super. so because of this you are lucky if you get between 1- 4 super final blows per strike. in my experience all the fragment umbral quests are flawed and very hard to do. the nerf to warlocks in pve has made the super not very good and because it is a 2 part super nearly all kills from super count as shatter kills and not super kills which makes trying to complete them super frustrating as well. If you are a solo player you are again not doing coop with your fellow guardians, instead you are competing to try and get the kills from your fellow guardians. there has been a lot of feedback from the destiny community that this way of doing bounties is not fun and we would like it to change. the quest should have included the super final blows from your fellow guardians as well , rather than you must get 90 super final blows all by yourself which is a lot of forced play in strikes . after 15 strikes i have 42/90 super final blows.