Hey!

Just wanted to know if there is anything I could do to activate Blind Betrayal after I accedently started Mass Fusion. I want to continue to help the Institute, so that I could eventually complete Underground Undercover. The only thing keeping me from continuing is the fact that I have to betray the BOS, and therefore Paladin Danse. I've heard that Paladin Danse however will stay by your side after you've completed Blind Betrayal, since he is no longer a part of the BOS. Is there anyway to start Blind Betrayal after I've started Mass Fusion? Proctor Ingram lines only start Spoil of War, which again makes Liberty Reprimed impossible to complete. Any help on the matter would make me greatful. Thank you.

Nope, if you actually start mass fusion, you turn the BOS hostile. The RR questline requires you to make the BOS hostile. Also, Danse will stop being your companion if you betray the BOS after blind betrayal. Either way, you are going to lose Danse as a companion.

You're SOL.

Despite Danse being a synth he still holds true every ideal of the BoS.