This question already has an answer here:
In the Last Jedi
Leia gets blown into space and then force-flies (like Mary Poppins) from space back into the Raddus. Leia's survival is answered here: How did Princess Leia survive this?
There seems to be plenty of SW canon for force-flying here: Can the Force be used to fly?
This post implies Vader didn't even use the force to throw Palpatine down the shaft: Did Vader/Anakin use the Force to kill Palpatine?
So why didn't Emperor Palpatine force-fly to stop himself falling down the shaft in Return of the Jedi?