How to revert the transition to its normal state?

followed this video

my script

IDK how it is made in this tutorial
But most simple solution would be to at beginning of battle scene
Create huge black circle which is bigger than camera in size so it covers it all
And just shrink it

have you watched the video?

I told you how it is done cause i did
I refer to what is around 3:16

my transition is just blackness sliding from the side of the screen

I have same exact event group on each scene
Only difference is to which scene it changes

Collide with water right from player
WASD or arrows