I'm writing a zombie novel, and there's a scene where the characters are running from the zombies. It's set in an urban area and the characters have lots of adrenaline pumping. The zombies can run faster than them and are able to climb obstacles easily, so is it reasonable to assume the adrenaline helps them run faster than the zombies? I can't really estimate the speed of the zombies. Just take 28 day style zombies and plus maybe 1 or 2 kph.