My thing here is, we did this with Blessing of Light before this try and failed because we got detained at the last second when he barely had a bee's dick of health left. This try we switched to Weapons and kicked his ass in 40'ish seconds. Weapons HAS to be giving bonus damage, somewhat, to the G'horn.
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I've done this 3 times and the first time we killed him without weapons and without a synth in about 15s. I took the clip on my xb1. The 2 completions after required weapons and synth, about 40 rockets - anyone experienced this?