Operation Floodgate Shredinator Mobs

So exactly how is this SUPPOSED to be dealt with?
Tried a 10 OF and these mobs were destroying us, even when i would try to pull them back to give people room.
So they just put blades all around and make it impossible to dps them (for melee) without having to kite them all over the map and pull a bunch of other mobs in the process…what am i missing?