I have recently reached this point in the game and have decided to go down the Institute storyline. However, when it comes to killing the members of the railroad, I am unable to kill Deacon as none of my bullets or explosions hit him. I don't know whether this is because he is a companion or not but this is rather frustrating and needs to be fixed. As I can no longer continue progressing in the game I hope this can be fixed soon otherwise I will not play it again.