 Not wanting to fail to save someone like he did in Las Vegas, Hiro goes back in time in an attempt to prevent her murder, promising Ando that he'll return in five seconds.Hiro's attempt to teleport to the day before Charlie's death goes awry, landing him six months in the past, on the day of Charlie's birthday.Though he considers another time-travel attempt, the possibility of being eaten by a dinosaur dissuades him.