Ha, I'm glad you enjoyed it! I wasn't sure whether my more abstract works would be accepted, considering most classical around here is fairly tame...
With West, that sound at bar 53 onwards is caused by bowing really close to the bridge of the cello. It causes the higher overtones to become way more apparent. The technique is called "Sul Ponticello" (I use m.s.p or 'molto sul ponticello' to really tell them to get as close to the bridge as they can!)
In answer to your "Did any strings break?" No, none did, BUT, the performer did lose a bit of nail with East...I apologised profusely and bought her chocolates as a sorry...

Those slides in North are harmonic glissandos, but the glissando varies between the pressed note and the touched note, causing that indeterminate ghost screech type thing...
And ha with the unresolved ending, it's a similar ending to West, but the context is different, which I thought was kind of cool!

Thanks for the comments, it feels great to see someone enjoying my work!
TubeyouYou are the hero My Little Remix deserves, not the one it needs.
So we’ll hunt you. Because you can take it. Because you’re not our hero.
You’re a silent guardian of music, a watchful protector of songs.
A doctor of dissonance.
-Phillypu