Old Card: Taki [1 dot]

The card says: "**E** Commit: Discard any number of cards. Choose 1 card in your hand with a difficulty less than or equal to the total difficulty of the discarded cards and play that card as normal (no control check needed)."

I'm not understanding how it's used as an Enhance; do you completely resolve playing a card (of any type) in the middle of an attack? Interrupt your opponent's attack with an Attack or just to play a Foundation?