You can get on top of the big rasputin ball in the warmind mission. None of the mobs can hit you from up there plus there is also a hidden ghost as well.
Hope this helps people and good luck
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Edited by Cobravert: 1/16/2015 9:10:43 PMIt's still not possible to kill all the Hive on the floor from up there. They stay under the dome and you have no shots on most of them. It's better just to run behind the control panel platform and use it as modest cover when needed. At least then you can get into it and kill things and move around if you need to. Getting rockets, grenades, or a super right on their spawn as soon as they are there also helps quite a bit. You knock out most if not all the weaker ones, and take some health out of the rest.