The grail runners are the most important people on the team. Their goal is in sync with the team goal, and therefore, all things revolve around them. As a grail runner, you do whatever it takes to cap the grail as many times as possible. Frags are irrelevant. You LOSE if you have 50 personal kills and your team has 1 less cap than the other team.
Death is irrelavent.
You gain full health when you cap and when you die, so dont think your life is worth anything. Monotony is irrelevant. I can die 20 times in a row to the same thornplants and not break a sweat. When I am flag running, I am inevitable. Defenses are irrelevant.