There are many things that move the main plot along. I won't touch on that for now. However, I thought that the other storyline was a sad one.
The Reinigen, rat-like Wesen, were simply defending themselves from attackers who came to "play" with them. The Grimm and his friends were put into a terrible position because of the cat-like Klaustreich who started it all. The Reinigen apparently only become Riesen-ratte, "the rat king", when they are collectively terrified.
Monroe summed it up - "There are no winners here". Everyone involved paid a price caused by the actions of a group of drunken bullies.
The Reinigen, rat-like Wesen, were simply defending themselves from attackers who came to "play" with them. The Grimm and his friends were put into a terrible position because of the cat-like Klaustreich who started it all. The Reinigen apparently only become Riesen-ratte, "the rat king", when they are collectively terrified.
Monroe summed it up - "There are no winners here". Everyone involved paid a price caused by the actions of a group of drunken bullies.