If your partner has reopened his vasectomy wound due to a sudden movement, it is best to apply gentle pressure on the wound and use cold compresses. He should try to stay in a lying down position. If the bleeding does not stop, it may be necessary to consult a doctor. If you are able to control the bleeding, you can wait to see if the doctor who performed the procedure wants to see him for a follow-up. It is important to avoid sudden movements and, if needed, he can take Tylenol and an anti-inflammatory for pain relief. If you have any other concerns, don't hesitate to reach out for further assistance.