Perhaps the clarity of the situation would help here. Its the fourth round. Oryx slams runner gets on and people on plates get on in quick succession. Guys on ogres drop them like flies. Guys on plates have taken care of knights. We all head to center to stagger Oyrx. He staggers. We quickly head to outside of out blights. I say go they all went in. My name pops up then immediately after three other names pop up saying blights have been detonated. We head back to mid to continue shooting Oryx (guys in mid were already shooting him though). Damage is dealt with only a quarter health taken away. After wiping in frustration death screen says all 16 blights were detonated. I ran it the same way I always have on Oryx challenge. I don't know how we could have been any closer in time. This is way I say it bugged on us.