What the hell is Doc doing?
I think he’s setting up a lab to make a serum for Dolls. It would make sense, seeing as its ‘time sensitive’ and 'for a friend’. I’m pretty confident we can rule out the Earp sisters as his friends, because they’re pretty solid as of now. Dolls is desperately in need of help right now, and Doc knew that he already killed the assassins sent after him. In fact, he knows quite a bit about Dolls this episode, which I believe supports this theory. Also, he seems to be setting up a lab, in which to manufacture the serum?