It isn’t the most reliable technique; but a practiced operator can usually apply a fair amount of social pressure, particularly to someone already stressed, distracted, etc. without any ‘real’ advantage over them. Additional leverage is helpful; but often unnecessary.
Doesn’t work on a determined adversary, an ardent rules-lawyer, or the like; but most people aren’t that, especially if they went into the situation with a presumption of decency and fair play.
