According to Osho, yes: if your effort in the first three stages is total, brief gaps of effortlessness appear, when breathing, catharsis, laughter or madness move by themselves. In those moments you are not the doer; simply remain aware and do not be afraid. Because you initiated it, you remain the master and can stop instantly, so allow the happening to unfold.
Yes; when you give your all, the practice sometimes runs on its own—just watch it without fear, knowing you can stop anytime.