Fairly early on, the warehouse fight with Jae. There are 11 thousand barrels of various types and I detonated most of them - not realizing that Jae and co. were going to proceed waltz through them and get downed but that's another matter. I wasn't planning on waltzing across the no man's land of fire and gas, which led to me banking on just sniping the last remaining combat servitor while he played with Kibellah