Originally Posted by Senator Pleasury
It's what's in the movie. Superman gets to see the kryptonite beneath the island surface when he feels weak. But when he's lifting the island, the kryptonite only emerges later (I assume the lower part of the island was thicker so kryptonite took longer to emerge).
And then we have the sun re-charge in between.
Supe should still have been powerless from the kryptonite inside him.A sun recharge wouldn't matter.He gets his powers from the sun,but it's not like it's some huge battery for him to draw powers from.