It always surprises me when people don't understand that the employee-employer relationship is an adversarial one. Unless you're in a democratic co-op or similar your employer is the enemy and you should never forget that. The correct move is to try to screw them in every legal way at every turn because that is what they are doing to you. Never divulge any information that increases your attack surface, always try to extract the most money for the least effort. This is capitalism 101.

You must not allow them to fool you into thinking that these aren't the rules they're playing by. David Sirlin's "Playing to Win" is a good treatise on how to be good, and perhaps the most important lesson is to play the game by the rules as written, and not by some other set of rules that exists only in your head.

(Though in this case the victim was senior enough that I suspect he was playing the game to the best of his ability, trying to humanize himself to gain the upper hand in some other manipulation game and misplayed, kicking things into the legal arena, as one does)