DataDrained
This movie was kinda wierd and had alot of questions to be asked
Like why did Ed go back to the other side
Can Mustang open the gate and does he even know about it
Why did they leave Whinry all by her self
If you destory the gate on one side wont it be destoried on the other
How do you destory the gate on the other side or destory it at all
WHY: To destroy the gate on the other side.
CAN HE?:YES any alchemist with the skill and the sacrifice can open it. And I do not know. if i had a guess, it would be no seeing as how no one any episode ever bothered to tell him about it.
WHY:Ed left to close the other gate. Al left because he wanted to be with his brother.
IF:NO. When the gate in Amistris was destroyed, it meant noone from Amistris could enter our realm, but if the gate in our realm was not destroyed it would serve as a one way flight to Amistris with no return package. So that is why the other gate had to be destroyed as well.
HOW: It is built like a doorway, so simply break it or tear it down and it will cease to exist.