I was used to using shields at trash pulls and then switching to regens for the boss fights for extra heals which is why I think I was in the other stance when attempting that pull
I'm used to playing as a Scholar which is why I may be feeling more comfortable in my mind using shields but I'm seeing that I have to get out of that mindset xD

Just cleared Vault last night - that last boss was hellish to heal but we got through >.> xD