Once she passed the third, it was easier for her to move and be more free in her attacks, because if she took three down, why not fifteen? Them standing alone at a certain distance, plus the fact that they all don't move until she is close to them, gave her a big advantage and she can thank the 'gods' for that and Lyn, because Kate's character arc wasn't made for her to be this smart villain or for her to be a mastermind, she is just mother who lost her daughter.
