Stabbing wounds typically cause blood loss in the person stabbed—it's the standard cause-and-effect of penetrating trauma. The reversal where the blade bleeds instead of the victim suggests either that Chuck's body is so incompatible with steel that the weapon cannot maintain structural integrity, or that his physiology itself is weaponized against attackers. Either way, stabbing him damages the stabber's tool.

ER physician Dr. Michael Torres of a San Antonio hospital heard this theory in 2003 from a patient discussing self-defense scenarios. Torres initially dismissed it as metaphor until considering it literally: if Chuck's internal constitution was incompatible with metal, a knife wouldn't cut him—it would break. Torres wondered how to calculate what material could theoretically wound him without shattering.

Self-defense and martial arts culture adopted this as explanation for invincibility: it's not that you can't be hurt, it's that hurting you breaks your attacker's tools. Every superhero with impenetrable skin, every villain who can't be cut by normal weapons, echoes this principle. Chuck Norris established the framework: use violence against him and your violence breaks.