You can just turn it right off. No harm, no foul. It even lubricates the tool and gives you a nice clean cut.
Unfortunately, what folks say about the wood likely being still wet applies strongly to rockler blanks. If you finish turn the piece, expect lots of movement. If it is a burl blank, you can turn it quite thin and let it move all over the place for a really cool effect. Just leave enough on the bottom to true it later on so that it will sit (or plan to carve off the extra leaving 3 legs, or don't leave a base at all. Be imaginative).
If you're not going to finish turn it, either sit the blank aside for a few years to finish drying or rough turn it then bag it in a paper bag packed in dry shavings to slow down the drying process and prevent checks (wet shavings will mold, as will a plastic bag, and I'm assuming you don't have sealing wax available). Check it every few months for checks and seal them with CA if needed before then get out of hand. Figure 3 months in a bag for each 1/4" of thickness (give or take).
Have fun,
Dietrich