The strike basically force you to kill every single enemy. Yesterday I was so boring so I start Roc then this strike welcomed me. (So sick) and during the claiming slope we killed the biggest "thing" and it created a huge shield (or force field) prevent us to move forward and we can't shot through the shield (but they can from the shield shot us. WTH ! The boss actually quite nice. The shield is better than Nexus I think. You don't need to wait so long.