It began on his thirteenth birthday. Every once in a while, he would get glimpses of alternate versions of himself dying. When he lost his footing but managed to keep outright, he’d for the shortest of moments sense a timeline where he didn’t. When he stopped for a red light on a busy street, he’d sense his other self who didn’t. Every time he might have died but didn’t, he sensed it.
Sometimes, it manifested itself as a brief sense of surprise that things continued. As if these other versions looked back, just this once.