I want to suggest that the sorcerer/sage bubble be placed on a damage limited amount (like a reactive shield; i.e. 3000points of damage) as opposed to a timed based ability.
Also, I'm a trooper and when I see the bubble on a person and try to use Gut, my attack gets absorbed. How does the bubble absorb a knife attack? I can see how the bubble absorbs energy/force power attacks, but this is a piece of metal I'm using to drive into the gullet of my opponent. It should go right through.