For a right handed shooter it fires when it is rotated clockwise enough.

So a right handed shooter has to draw it back with a counterclock pressure so it won't fire before you want it to.

then you settle in and by squeezing your shoulder blades together, this in turn gets the release rotated enough for it to release.. on a good one you never know exactly when this might happen. So you had better been aiming.

When squeezing with your shoulders if you can't get it to release, then you have two options. Lete down and start over, or give it a quick clockwise twist with your fingers and it will go off. So, yes you can still punch a backtension release if you want to..