What If You Go to Get Nuclear Bombs With Paladin Danse in Fallout 4?

Have you ever wondered what would happen if you went to get the Nuclear Bombs for Liberty Prime with Paladin Danse in Fallout 4? Normally, if you go there alone and then return to Elder Maxson after completing the mission, you find out that Danse is a synth and that he has run away. But what if you take Danse with you on the mission? How could he escape if he never leaves the main character's side?