So I am to the part of the 'Long Time Coming' mission where Valentine travels to Andrew Station and you need to meet him there. I rarely fast travel so I went to a settlement and unloaded some loot and headed his direction. I got there and entered Andrew Station where Valentine is waiting. I travelled through the subway system killing those in my path and assumed Nick was following. However, when I got to the door where (I can only assume that Nick has to hack it) he was nowhere to be found. I back tracked and found him in the entrance room in a stance like he was waiting for an enemy. He occasionally says some threatening remark as if someone is there but no one is. I tried reloading it and he does the same thing. I can't talk to him even though the option comes up. I tried hitting him with a frag grenade and he goes down but it won't let me stimpak him. I haven't found a way around it and I can't proceed with the mission until he snaps out of it... Anyone have this issue and found a way to fix it? I'm playing in Xbox One.