I can't even imagine the thoughts in his head as he considered all of the variables, but ultimately, he acted to the most inner true nature of human beings: altruism. Most people do not live even a moment in their lives knowing such a state.
Words are clumsy, and they will not do for the bravery, the selflessness, the compassion he had for others, the wrongs he stood against, and the malice attempted against others that he sacrificed his life for, in that single moment.