Lol, whoever that is cleaved a rat on the ground. The number in the background shows exactly what I'd expect: 10k after finishing HB.
Possible. But, even still, who's to say that hitting over 10k with a single attack is something that is totally fair? Sure, you can say that Warriors can be beaten if you know how to dodge but their recharge rates are lower than your regeneration of your dodging ability, so at some point they end up breaking you down.
Warriors are easily spammable. Just like when Thieves had uber-powerful heartseeker. Very commonly used (far too common) tactics and certain attacks used time and time again by everyone who has success with the class suggests some problems with balancing.