Review Detail of Cpt_Rumpel in Harry Potter (Fanfic)

It started so good, it's awesome to read. .. Until you reach the chapters 115+ then the quality drops almost into a bottomless pit. The grammar is hideous ,it seems that another writer just took over and this new writer is like "srry engrich not my langutsch but letz me writ dis reeel quik once" the well developed flow of this story just gets a kick in the proverbial nuts(excuse my french)