This is EXACTLY what I've been doing.
I find that Chris works best for me, and if you can get a Bloodshot on its own, quick shot (or knife in this case) and it will instantly go to it's knees, easier than I thought!
Also hoping the knife kills whilst enemies are floored count and it's not just a physical attack, Chris does use his knife, after all...
Nice scores, Veedrock! I'll try to catch up some tomorrow!