Variables in math have dont have a specific value but variables that we are using in computer science have specific values for each variable
The two scopes are for all sprites and for this sprite only
A variable can only have one value at a time
It wont work because if they change at the same time they wont have anything to copy when switching because they other vareiable will have the same value it already has.
The value 1 and value 2 are being switched because the temp is temporally holding one of the variables so they other can copy it without losing its original value