At 4:30 a.m. on Sept. 12, 2017, Roy Guill woke up to a Facebook message from a man he'd never met.
The man, Eric Delman, explained that he'd been going through some stuff from 9/11 for the previous day's anniversary. He wanted to know if Guill was from Staten Island.
But it wasn't Delman's message that struck Guill. It was what Delman was wearing in his profile photo: a yellow, coal miner's helmet with a bracket on the front where the headlamp used to be and a dent in the brim.