I record AfterDark - so I always watch it the next morning - all 3 hrs - I know, its sad, to be so hooked.
He takes her off (and the other person also, if he wants) and he decides who goes in her place. B/c he decides, it can't be himself :) It can't be the HOH nor the POV holder either. In the event of a tie of the votes, he decides who goes also. He is basically the HOH this week.