OMFG.

Sorry for the delay, I had to go in to work for a few hours.

I'm NOW here to CONFIRM that when multiple people are NS'ing the same target:

A) each person gets their own debuff
B) each person's debuff gets REFRESHED and gets INCREASED with subsequent NS's
C) each NS is "smart" in that healing does not deplete EACH NS application, instead
D) IT ONLY EATS UP THE PREVENTED HEALING FROM THE OLDEST BUFF TO THE NEWEST
E) which means it basically "stacks"

So to sum up:

NS is the f'ing bee's knees and will dominate people.