This challenge is definitely one of the more difficult/time consuming ones that we have done before. Let me give you a run-down as to why that was. It's obvious that not having anyone take gaze makes the critical spot in his chest not be visible, which causes the damage output to be very insignificant. With this known, the proper build setup we concluded to use for this challenge would have to be something along the lines of high damage in small amounts, while still consistent, which is why we concluded with fusion rifles, stickies, and at least three people to wield damage amplifiers (me, as the melting point titan, and two others as tethers.) Since his enrage timer is not too much of an issue, the amount of time in-between damage cycles allowed us to be able to get our extra bit of shots off before we better prepared for proper damage output.