Doing a Boromir

Term used to describe when someone, usually a BAMF, takes multiple fatal wounds and keeps fighting and killing until they eventually die. Comes from Boromir of the Fellowship of the Ring when he is shot over and over again with arrows and still keeps killing urukhai until he dies from the wounds.
Not to be confused with a Generic Action Hero's ability to shrug off life threatening wounds like scratches (see Die Hard)