Life to force!

Vitality Block [reaction] Feat 1

• Concentrate Mystic
  Trigger: An ally in your vitality network is subject to an attack

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You pull life essence into the real world to protect those you care for. As a reaction, you spend hit points from your vitality network equal to 1/2 the targets level, rounded down, minimum 1, and give the target a +2 circumstance bonus to AC. This shield functions as the shield spell, but does not function past this one attack the target is subject too.

Thoughts?