Why did you lie to us Riot? Either bugs or Riot lying about Aatrox.
According to http://na.leagueoflegends.com/en/news/game-updates/patch/patch-75-revisiting-aatrox Riot states only one way for Aatrox to deplete his passive. "Aatrox fills his Blood Well through his abilities. When it fills entirely, the Well begins to empty over 4 seconds, giving him a new buff - Blood Rush - for the duration" This means Aatrox's passive should ONLY decrease when it reaches 5 stacks, NOT within a given time frame. You should be able to fill 40% of the Blood Well, afk for 5 mins somewhere or even die, and still have 40% of the Blood Well filled.
Another issue is that you state that Aatrox can still stack his Passive when under the effects of Blood Rush which could mean a potential infinite Blood Rush BUT that does not hold true. "While under the effects of this buff, dealing or taking damage versus champions will fully refresh its duration (and fully refill the Blood Well)." If this holds true then why does Aatrox NOT gain stacks and lose all his Blood Well stacks during the 4 seconds Blood Rush has activated? If I use a Q and E while Blood Rush is active, Blood Rush should either have its duration prolonged or end with me having Blood Well 40% filled up. Instead what actually happens is that Blood Rush lasts 4 seconds and ends with you having 0% in Blood Well.
The last problem with Riot's post is that Aatrox's new E should have a 70% bonus AD ratio but in-game it is only 20% bonus AD ratio.
Either the post was rushed or the game devs didn't do their jobs right. Either way, someone was slacking. (I have no clue where to put this discussion as it covers gameplay, bugs, concepts and creations, boards feedback, and general discussion so I'll have it in Gameplay).