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Christopher Reeve Superman. How come he's fast enough to go back in time, but not fast enough to save Lois in the first place?
Scene needed is Jor-El explaining that Clark is as strong as he believes himself to be. He can literally focus the entire power of the Sun if he's strong enough.
Do you think he was flying around the earth for kicks? No, he was using a gravitational slingshot to build speed. Granted, they could have explained it better, so I guess a line like "we need to use the turn of the world to speed up our satilites, and we still can't match his velocity. Imagine how fast he'd be." But less clunky, of course.
https://en.m.wikipedia.org/wiki/Gravity_assist
That's not how gravity assist works. You need relative differences in speed.
Someone once explained it that watching the earth spin backward was not him flying so fast that he literally dragged the Earth in reverse but rather that the Earth spinning backward was a byproduct of our third party view watching time go in reverse because Superman was traveling back in time.
But he would have to literally be stronger than the sun to do that because the only way you can travel backwards in time is to travel faster than the speed of light.
But it's movie magic so what can you say?
Honestly my head canon is that just like how humans on a hell of an adrenaline rush can do superhuman feats like lift a car for someone trapped under it, superman has basically the equivalent, breaking his known limitations through sheer force of adrenaline.
Kind of like how in one of the early seasons of the CW Flash series, Barry accidentally travels back in time while pushing himself to stop a tidal wave from destroying Central City.
I like that idea.
In a similar vein, Supes could be much weaker if he were asleep or distracted. In the current iteration, if Clark Kent gets hit in the head by a ninja the weapon breaks; in the new one, he can be knocked out if he isn't pumped up. Sort of like how Houdini was killed when he told a fan they could hit him as hard as they wanted; he meant after he'd had a moment to prepare.
That one really annoyed me because like the next episode they were saying he needed to go mach 3 which was faster than ever! And I was like.... Is time travel less than mach 3? I'm pretty sure have jets that can go Mach 3...
Yeaaah CW Flash was really inconsistent with its power curves and growth.