Nova Bomb doesn't regenerate health, I don't know where people keep getting this notion from. If you want to talk about running, Titans [i]are[/i] the most mobile class through Titan Skating and come on, if you want, you get a shield that can take a shot from Golden Gun. As I've already said, Death From Above gives you the effective range of Nova Bomb with greater speed and accuracy, while the Shatter and Lance for Nova Bomb decrease the range and accuracy, respectively.