"What do you think you are doing?" "Waiting for you......" Love their conversation in the movie, no nonsense, just straight to the point. Brave hearts is what they need.
He could explains life, but not his own. He wanted to save lives of others, but he failed and even worse, with cost of another's and his own. He proved the truth like this: it's not the "it" that you want, it's the fantasy of "it" that you want.