[Solved] Calculating a variable difference of heights

[HerlySQR]

I wanna create a lightning that comes from point a to point b using timer, but I wanna also change the height of the other extreme of that lightning that goes from the height of point a to b, taking into account that these can also vary, how must I calculate the height of each moment?

 

[HerlySQR]

He, at the end I solved this myself XD.