I cannot clear the last boss in this lost sector. I believe I quit the game after I finished this lost sector but I am not certain. I had trouble with the boss earlier in this lost sector as well... they both just keep respawning after death. Over and Over. The earlier boss, I was able to defeat by headshot-ing it over and over until it dies over the edge of the map. But, I cannot do this with the final boss. I'm stuck and cannot progress in the campaign now. I wouldn't mind just starting the mission/quest over a few steps back but there is no option to do this. omg I figured it out... i needed to walk up to the orb and just press G. the finisher. Please delete this post! I am a silly person.