Shield doesn't Prevent Master of Disguise's Ability

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not sure if this is a bug but I had a unit with a shield and it was boosted to 10 and my opponent played master of disguise and swopped the power from my card to his and set my unit at 4. So my question is shouldn't the shield have prevented this as it lowered my points on the card?
 
Technically, no, since the shield only protects against damage. The Master of Disguise swaps his power with an enemy unit, rather than dealing damage. There are a few cards which can negotiate around shields, without removing them.

Edit: Mods collide!
 
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