Raids.

General:
Boss HP
Boss stats

Specifically, Vasa Nistirio.
Questions:
Can crystals be attacked if Vasa isn't focusing it? no
How long will Vasa stand at a crystal healing before moving on if the crystal isn't destroyed? 15-30s?
If you were to destroy a crystal Vasa is walking to, does it immediately start routing to a new crystal or does it finish the walk over first?
How much/how fast does a crystal heal Vasa while it's at one? ~5%/10s