Brown Grumbils on Meth?

I've noticed that Brown one's for some reason do everything ALOT faster than the others I have faced. One loaded counter faster than I could load windmill, and after smashing I used counter, and it hit me with a smash before it was loaded! They recover instantly from knockback and even seem to strike faster. Compared to the other grumbils, they are very sped up and the only thing slow is their aggro and stomp. Is this just a weird server glitch(I have encountered similar things before) or are they just like that?