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[RJNorton]

Where exactly was Rathbone sitting in the box; that is, on which end of the sofa? How close was he to Lincoln? Wouldn't he have noticed the door opening behind Lincoln - maybe some light came in as the door opened - and shouldn't he have jumped up sooner?

This leads to the question of which door Booth entered - was it to Box 7 or Box 8? Doesn't Mike Kauffman say it was Box 8? If so, that would make the angle harder for Rathbone to see as it would have been more behind him than off to the side.

I think the door to Box 8 was already open, so if that's where Booth entered, then he didn't have to open any door (other than the one to the vestibule).