If you tear, you tear. You can try perineal massage, but other than that, there's nothing you can do. I thankfully didn't tear, but my son crowned for close to an hour and even with the epidural I felt like my vagina was about to rip in half, lol. But my doctor explained it as a turtleneck... If you quick pull your head through the neck hole you're more likely going to rip the fabric/stitching than if you pull it over your head slowly.