yeah not as straight foreward as it looks. Took another hour long wack at him again......nope. Best I can do it get him down to 2 bars.
In the second part, his pattern changes based on where your located.
I guess it's just a skill thing then, because I just tried it out on real hardware and it turned out to be
way easier than it appears in that video.
My capture card wasn't working and I didn't have time to restart my computer, so I couldn't record the fight.
It can be done very quickly if you mostly knife your way through. As soon as the fight starts, move to the right, a bit below the middle and rapid fire knife him as he passes you on the right and then knife downward as he passes below you. You can shoot him a bit as you run up to cut him off at the pass again, but if you've you've fought him once or twice, then you should have a feel for his pattern and he won't last more than two loops around the screen.
The second pattern is much easier. Get as much knifing in as you can at the bottom of the screen as he first passes by, then just casually shoot from a distance until you can get close enough to finish him off with your knife. It's much easier to dodge than than a couple previous boss fights.