There’s something primal, buried deep in the limbic system, about the desire to protect something you care about deeply. The famous example is parents gaining superhuman strength and lifting cars out of the way of their offspring, but it shows up in quieter ways, too, like a gentle, animal-loving soul become Death, destroyer of squirrels and moles, when one’s dearly tended garden is being ripped up. It can also show up as a flow state, like when you’re nursing a narrow lead at darts against your frenemy Alex and suddenly the only thing that matters is playing the best game of darts that’s ever been played and everything else falls away as your consciousness shrinks to a pinprick, a bullseye.