Talk:Invasion/@comment-107.4.27.206-20131027021955/@comment-92.77.114.196-20131027103502

as lore for siding with infestation faction in this type of mission would suggest:

Infestation is spreading on the battlefields as grineer and corpus are too busy killing each other to notice this right away and contain the infestation. since the Tenno dont want either side to win they fight against both corpus and grineer to make sure the infestation reaches numbers where they can effectively take down both grineer and corpus, thus dening both their goals.

as to why the infestation works together with the tenno: i think some infested bosses mentioned the tenno being one of them sometimes, so the infestation takes care of yet to be infested lifeforms, since the tenno dont attack them. so basically they prioritize infesting grineer/corpus before killing tenno that dont pose a threat at the moment.