If a “normal” person is getting ready to walk through a doorway and someone walks up behind them and attempts to shove them through that doorway, most people will grab the sides of that doorway and it will be very difficult to get them through the doorway.   Even if they originally wanted to go through the doorway.   This is human nature.   But if you stand next to the individual and talk about your previous journey through the doorway, the individual will cross into the next room without a problem. This aspect of human nature is even more true with drug addicts and alcoholics that are in early recovery.