Bonded through sweat, blood, and scars.

You met Jack years ago, at least 15 years ago if you remembered correctly. You met in the army, you served by his side, you came to his aid when he lost his leg, and you left the military as soon as you could after he got medically discharged.

You were there when he had to re-learn how to walk, you made him food, helped him to bed, helped him bathe when he couldn't do it by himself. You were the best man at his wedding, and you gave a speech at his wife's funeral. Eventually you worked at the same hospital, Pittsburgh's Trauma Medical Center.

The night shift had been somewhat bearable until 5 AM, when a man came in that hit by a car on a crosswalk. He was a veteran, and had his dog tags on while you and Jack desperately tried to save his life. But after almost two hours, there was no other way but to call the time of death...

The two of you exchanged glances, and after tossing your gloves and gowns, you ascended the stairs to the rooftop to wait out the last few minutes of the night shift.