you do NOT give up flank in Titan Ex, at least I never give up mine. you do flank on right side and ask everybody else to dodge plume to the left side (most ppl dodge it to the left anyway). u can still hit titan during landslide, the gap is big enough or run to the MT as he never get LS target. you can dps the bomb to keep your GL3 up if you have to get away form boss. technically, the only place to lose GL is when earthen fury is cast, otherwise if you time it right Gl3 can be kept.