I’ll bet anyone dollars to donuts that the editors for the Yahoo! front page have no idea what an antecedent is and why a pronoun must agree with it:
An antecedent is the noun that a pronoun refers to. The pronoun must agree with its antecedent, meaning that they both must be the same number (singular or plural). A plural noun (like oh, say, maybe fights) requires a plural pronoun (like them).