According to her complaint, shortly after she boarded the Richmond train and settled into her seat, conductor Donald Prince told her to move as he walked by. She stayed put.
A few minutes later Vicky Kadans, who is white, asked McMillan if she could sit next to her. McMillan slid over to the window seat to make room.
Prince soon returned, "and in a loud and intimidating voice," again ordered McMillan to move, explaining that two people who wanted to sit together were boarding the train. The complaint notes that Prince did not tell the white passenger to move, and he threatened to put McMillan off the train.