And so he protected that advantage with the performance of his life.

He grabbed his suitcase, and he walked out his own front door, past his smiling wife, leaving his daughter behind in that house for the last time.

It was the most frightening thing he ever did, walking out that door.

But he understood that to protect Lily, he had to appear, for a few more minutes, to abandon her.

He never went to the airport.

That walk out the door was, Marcus has said since, the single hardest thing the whole ordeal ever asked of him, harder than the footage, harder than the confrontation, harder than any of it, and it is worth understanding why, because it runs against every instinct a protective parent has.