What happens at 4 a.m. on July 13th in the novel, Absolutely Remarkable Thing?

At 4 a.m. on July 13th, at the same time that bombs are detonated at various Carls throughout the world, someone tries to shoot April through her apartment window. Something punches her in the shoulder to knock her out of the way, and she realizes that Hollywood Carl’s hand saved her life. She has a mildly successful conversation with the hand, but when she falls asleep and wakes up again, it is nowhere to be found.