The 15% of max hp spell interruption change discussion

[Iagainsti]

You're not that vulnerable, seeing as how they are removed the second you take any damage.

I believe the Ferb means Party vulnerability. When you take 1+ players out of the mix, it makes the remaining players vulnerable without the CC'd player(s) damage/heals/enfeebles being utilized.

On the same note, That is the point of CC.