One moment is all that's needed to change everything. One moment, and someone very dear was taken from him. One moment to know he couldn't let that happen again. Sherlock's life was a series of moments, good and bad, that defined who he was and how he lived his life. Night was beginning to fall at Baker Street when they got the call. That moment, everything changed again.

"Sentiment is a defect found in the losing side." He always had known those words to be true, and now he had been proven right. At what cost?