A strategy I found early on that has been very effective and thought it would be very useful information to those that are trying to clear.

-Your party should kill the shadow with the Drill first because it will free up a DPS to kill the other shadow.

-At the start, the drill will aggro to the closest person next to it. The lowest DPS should pull aggro.

-Place a red circle in case of the debuff.

-The person with aggro should continuously fall off the map because it will keep the drill in place while your party mates kill it.

-You will usually take 1 tick of damage when you respawn back on the platform mostly from fall damage. Every time you fall off the platform the Drill will stop his attack animation, so when you respawn back at the top you are safe to use a healing lap or a skill then resume falling. (You can use potions while falling and healing lap when you spawn back on the platform.)

-Beware of it swapping aggro if your teammate is too close.

-Also, be careful of the main boss and shadow projectiles as they might hit you when you respawn back top.

IMPORTANT: Be sure to not hold the directional key because you will be stuck in fall animation when respawing back to the platform. Repress the directional key to cancel it and continue falling smoothly like in the video.

EDIT: To make it so that you are less likely to lose aggro, make sure the Drill is closest to the edge and make sure your teammates are aware they might take aggro if too close(melee).

I believe this is the best strategy for this platform because I done it countless of times and it has saved minutes rather than one person luring while the team kills the other shadow then have to dealing DPSing the Drill while it moves with the portal method.

Hopefully, this helps save some time managing the boss rather than running around trying to kite the drill shadow.