Once again he was threatened by Lincoln, and as before, kept silent.
After 20 years, and discovering that Tombstone was operating in New York, Robertson testified against Tombstone and had him incarcerated, but not before having his spine severely injured by the criminal.
Intimidation (also called cowing) is intentional behavior that "would cause a person of ordinary sensibilities" to fear injury or harm.
You can intimidate only an opponent that you threaten in melee combat and that can see you. Changing another’s behavior requires 1 minute of interaction.
Threat, criminal threatening (or threatening behavior) is the crime of intentionally or knowingly putting another person in fear of bodily injury.
"Threat of harm generally involves a perception of injury...physical or mental damage..or instance of injury, or a material and detriment or loss to a person." Threatening behaviors may be conceptualized as a maladaptive outgrowth of normal competitive urge for interrelational dominance generally seen in animals.
Intimidate was introduced with the Magic Comprehensive Rules revision for Magic 2010 even though no cards with that keyword were printed in that set.
It functions similar to Fear, which was considered to have the wrong flavor and could only be used in black. Khans of Tarkir block had no cards with intimidate.