concealing another person whom replaces the experimenter as the door passes.
(Very minor and content-irrelevant point here, but my grammar nazi side bids me to say it, at the risk of downvotery: it should be “who” here, not “whom”, since it’s the subject of the relative clause.)
(Very minor and content-irrelevant point here, but my grammar nazi side bids me to say it, at the risk of downvotery: it should be “who” here, not “whom”, since it’s the subject of the relative clause.)