Stop being so salty
But seriously, it depends how they are playing the class. Orochi is the class I put the most time in, so this is what I've managed to learn from playing:
Back dash while holding heavy attack is how the orochi does that stance (Where they are crouched over and holding the blade behind them in one hand), and then from there you can either cancel it, do a running horizontal slash, or a feint.
The key to besting orochi who rely on this move is to watch for the back dash, then immediately guard left or right (direction corresponds to which hand the blade is in while orochi is in that stance, if he's holding it in the right hand, your blocking left and vice versa). Then, if you do guard it, immediately guard break instead of attacking normally, as most orochis I've played (and myself) immediately guard following this attacks failure.
Then there's the light counter. The trick to this one is heavy cancels and guard breaks as well. You can only do the counter if your guarding, so canceling the heavy will throw off the orochi into guarding a particular direction, and from there its up to you. Counter attack or guard break into a set up.
Then there's the hardest to deal with, the left, right, or forward dashing light attack. This is the one to watch for, because of just how comfortable people get when there's distance between you and them. The only advice I can give in this scenario is to never let your guard down, and block in the direction they are dashing in (they dash left, you block left. They dash towards you, you block up)
The real threat comes from a player that can do all these dynamically in the fight, instead of just relying on a single easy to exploit strategy. That's when it comes down to out thinking instead of out playing, and relying on what your classes strengths to overcome the orochis weaknesses.
I have the hardest time dealing with people who can reliably guard break and the class I have a very hard time dealing with, even as the orochi, is the Viking with the long battle axe. Destroyed me up almost every time.