November Rain sends down rain droplets with enough pressure to kill a person. Normally, it's only within a 3-meter radius, but when the guy was shooting at Jodio nonstop, a few of the bullets bounced away, and a few of the droplets splattered outside his range onto the ceiling above both of them. Since those droplets were created by his Stand, he could still cause them to rain down with immense pressure, even if it was outside his range. The assassin stepped underneath one of those droplets, and Jodio caused it to fall straight down onto his head, piercing through his brain and out of his throat, presumably killing him instantly.