IGN of reported player:
Pectin
Reason:
Macroing? Seems like every time this guy tries to block a combo, he always does more than 1 block (which hints at a block macro, since he holds to active; it repeatedly blocks until he releases the button, and its never after just 1 block). When he's rushing or peddling, almost never controls a massive and instantly lets it go (see replay #1, very obvious).

The replays are sometimes bugged because of autorecord but if you reopen it enough and play around with the fast forward it fixes itself. Either way i think if you slow it down enough it can be easy enough to see how fast his blocks are even from my POV, the first one doesn't even end its animation before a new block comes, and at times i'm not even close to him when he uses it.

The butterflies are way faster than that of a normal tbf, in replay #2 he did many such bf-combos (and just spamming spacebar manually it seems). Mostly noting the excessive usage of block macro when he's not even being slashed, and that they are never just 1 block.
Proof/Evidence:
https://www.sendspace.com/file/khyre1 (1)
https://www.sendspace.com/file/3lp6ms (2)
https://www.sendspace.com/file/ah6jx3 (3)
https://www.sendspace.com/file/kq4ni8 (4) (lots of block macro usage in the earlier half of the fight)