Baluski - yes, that seems like common sense that if they were alive & able to hit you, you would not have had a flawless fight.
HOWEVER, if it was determined that I had the ability to go first, and I hit the enemy with an attack that caused damage > 4x their HP, how exactly can they then hit me with their "buffed up attack"?
I understand that there is no "hit > recalculate HP > riposte" calculation in place at the moment.
It is for that very reason that I think if the new "buffed up" enemies hit you ONLY with a jutsu, you should not be penalized . . . ESPECIALLY if you had already dealt enough damage to kill them before they attacked with their own jutsu.
Of course, your mileage may vary.