法博士: 去年10月,王某在步行下班途中,忽听前方一女子高喊:“抓贼！”同时见一男青年(刘某)骑车抢到该女子的背包后,疯狂逃窜。当刘某逃至王某处时,王上前一脚将刘揣倒在地,并擒获。但刘某即被公路上正常行驶的小汽车撞伤。后经查实,刘抢得手机、传呼机及人民币共计3000余元。在公安机关审理此案时,刘某家属要求王某承担医疗费用等相关民事责任。请问,王某该怎么办? Dr. France: last October, Wang on his way to get off work on foot, suddenly heard a woman in front of shouting: “catch thief!” At the same time see a young man (Ryu) riding grab the woman’s backpack, crazy escape. When Liu fled Wang somewhere, the king stepped forward Liu hurled to the ground, and captured. However, Liu was hit by a normal car on the road hit by a car. After verified, Liu grabbed the phone, pager and RMB totaling more than 3,000 yuan. When the public security organ tried the case, Liu’s family asked Wang to assume the relevant civil liability such as medical expenses. Excuse me, what should Wang do?