because Satan was never in heaven to begin with.
I think it is Christ who said : I saw Satan falling from heaven as a thunder..
Why did he say that before his crucifixion?
Because He wanted to. What does it matter?
"I confidently affirm that whoever calls himself Universal Bishop is the precursor of Antichrist"
Gregory the Great
"Never, never, never let anyone tell you that, in order to be Orthodox, you must also be eastern." St. John Maximovitch, The Wonderworker