I found a strange conversation with a kid squire during Rocket's Red Glare mission. By this time, I was already knee-deep being enemies with the BOS.

I started anatagonizing the BOS from Mass Fusion (not telling the BOS). Then, Z1, the rebel Synth in the Institute told me that the Railroad HQ is found out by the BOS. So I went back to their HQ and protected them. This concluded Underground Undercover as completed. This completion was followed by Rocket's Red Glare to massacre BOS at the police station and Prydwen.

Footage below was recorded during the end of my massacre at the Prydwen. All the advlts in the main deck were killed and the kid Squires were running around, except this one, with weird conversation. Not sure if this was a bug that this conversation was supposed to be cut or totally intentional.

http://youtu.be/IMzlRzbljqE