To be fair, it is canon that there are Servants that can shug the snarling. By example Sparthacus. Yeah, he is still unreasonable to the point that you can't control him, but he can speak and all that, so it's not that unbelievable.
That said... fuck that, I retire my +1. I got pissed at the super butler, and after reading you guys, I'm even more pissed.