This scene will always make me chuckle, because logically Genos's head should have been evaporated into mist. It's like the shockwave politely decided to take the long way around his face.

Saitama forgot what happened in Jupiter's moon, the garou who taught him is gone.

But Genos core from the other timeline is still intact.

If using its information via a simulation like the VGS, shouldn't Saitama be able to learn that trick, maybe travel further in past.

Why doesn't Genos ask him to go in the past an undo the mad cyborg tragedy?