This is so freaking true. During Doomsday, if it had been Nine, he wouldn't have hesitated. He would've let go of the magnetic clamp and run as fast as he could to grab Rose before she was sucked into the Vortex. Even if they had to go down together, at least they'd be with each other. And he wouldn't have cared if two universes collapsed. Nine would step right into the parallel universe and tell Rose he loves her.