Is a term used to describe someone unwilling to quit or give up, even at the risk of one's own safety, sanity or life.
Only a Paul Feeney would walk across that burning broken glass on the edge of a cliff to save that half-dead, run over puppy from that hungry lion's mouth.
You'd have to be a Paul Feeney to think anything can be done and not just give up already like most mortal men.