6 times.
I have to admit, it was this fight that finally got me to really play the class properly and to set up my buttons properly.
You can get through this game without playing your class properly all the time.
Here is what I learned: this encounter requires you to really do your interrupts properly. Now, at this level we have Kick, Stasis, Force Push and Hilt Strike (I believe I have the names right, I'm not at my PC where the game is installed). In any event, there are 4.
During this fight, I got killed over and over. Clearly the problem was that I was not interrupting all of his powers. The reason for that is I had all my interrupt skills all over my button bar. So, after dying for the 5th time, I rearranged my button bar and put all my interrupt skills in a row on the upper right of my bar, with Kick first, then Stasis, push, etc. That way it was always easy to see what was on cool down and what wasnt. And I focused on keeping my Focus up so that i could always activate any interrupt whenever he started to use a power on a timer.
Once you do that, you can make it so that you are always able to interrupt his powers. If you do that, you will win this fight.
I'm glad it was an encounter like this that made me finally get my act together and break out of my lazy play.
The 6th time, I killed him easily. In fact, once you play it properly it is surprising how easy it is. I was, frankly, embarassed I had been doing such a bad job.
So if you are struggling, make sure you identify all your interrupt skills (and my recollection is that the skill text does not always properly identify the skill as providing an interrupt), then put them all next to each other on your button bar. I prefer Kick first since it is your primary one.
That might help.