Usually a blockstring like that would involve 2A 5BB 2B 5C 2C 6C 236A 236A 214C 22C then I usually go into d.2A repeat, or if I know I'm a little slow, d.5BB so I keep some distance and can't get poked or dp'd. There's also the grab option.
This is part of a really easy guardcrush string against H-Moon that I've been meaning to post.
If you're in MAX and have them in the corner:
2a, 5bb, 2b, 5c, 2c, 6c, 236b, 236b, 214b, 22c, 5b, 2b, 5c, 63214c, 5c5c5c5c... etc. until guard crush.
If you do it right you'll activate 63214c right before MAX runs out and get to keep your meter. The only place in the string where they can try to shield/dodge/dp is right after 22c. And they could bunker too, of course.
I support using your knife for pressure strings than to add like 200-500 damage to your combo
I think that if you're midscreen, using the knife in combos is the only way to get better-than-average damage, except for using 63214c, which is really hard midscreen.
This is a really easy midscreen combo that does 5.1k to V.Sion for knife and 100% meter.
2a, 5bb, 2b, 5c, 2c, 22c, 2c, 5c, 5bb, j.bc, dj.bc, j.236b
Compare that to the normal ground string, 2c, 6c, j.bc, airdash j.c, dj.bc, j.236b combo, which does 4.3k to V.Sion.