I wanted to run my newbie friend through Zero Hour and in the normal mode, we are hitting a really big wall at the boss fight. All enemies spawning at once, all servitors, spider tanks, and shanks. I destinctly remember when I did this that the boss was phases, where the shank spawned with him when he moved, and the servitors were one at a time, not every shank and both big servitors together. It feels impossible with a two man, and I two manned the Heroic with another friend to get the catalyst way back when it first came out. Is this a known thing?