Infection

So this whole infection sprawled out, of this bad chemical that brought out very much piwer and made people really just have there minds put at, "I have to cause destruction and k1ll everyone" so ya obviously you wouldnt want to be infected. The infected have to bite you in order for you to get infected. You are in a situation where you are in a forest getting chased by one of the infected, he then pins you to a tree and is about to strike, what will you do?