I'd react and ask questions later. I have a serrated knife on me about 85% of the time, and there are times where I have it at the ready just because a situation doesn't feel right(granted they are few and far between). If you try anything funny and put my life in danger I will not think twice to slash your throat, stab ur armpit(left), or stab ur inner thigh....all major kill points. We all want to live, and that fight or flee reaction takes over in these situations.