You make the call?

[NOCajun]

No out is charged but if the batter backs out without permission and the pitcher throws the ball the umpire will call a strike.

What if the pitch is not a strike??

[CajunVic]

https://baseballrulesacademy.com/off...ing-the-pitch/

For those too lazy to click on the link:

Batter steps out of the box during the pitch.
If the batter steps out the batter’s box during the pitch and the pitcher delivers the pitch, a strike is called on the batter. If there is a runner on base, and the batter leaves the batter’s box with both feet during the pitch and the pitcher delivers the pitch, two strikes are called on the batter. If the pitcher doesn’t deliver the pitch there is no penalty for the batter or pitcher.

[CajunMarineBBK]

If I remember it does not matter it will be called a strike.

[JMV JustMyView]

What if the pitch is not a strike??

The umpire will call a strike as he has no strike zone to go by.

[JMV JustMyView]

If I remember it does not matter it will be called a strike.

Correct.

[CajunVic]

If the pitch is made, it is looking like the umpire will call two strikes.