Doing my replay and something interesting happened.

So I'm replaying following the railroad story this time around. I got bored so I went to investigate the brotherhood. On the first mission we entered and I literally just waltz my way through cause the synths won't attack me. I was like hell yeah. I'm afraid to return fire cause I don't want to ruin the institute relationship yet.

Edit: I remember now. I was about to do the fusion mission and warns that the brotherhood would become permanent enemies. That's why I decided to do some missions. I want to get piece of decent power armor before I fuck them over.