I was out trail riding with a friend after last years hurricane here in Ct. We went to go around some downed trees, with me following her when I ducked some branches and didnt see the large tree limb that hit me square in the forehead. It pushed me back, I could hear all the bones in my neck cracking as it snapped my head back. We were only traveling at a hurried walk and I didnt fall, just got hit in the forehead with a large tree limb. Should I reaplace this helmet? It is a Seirra that is about 4 yrs old. Thanks