For every 2 of your life cards that you now remove from the game, you may remove from the game 1 opponent drill of your choice.
Now remember Bulma, you promised not to sing any more.
Errata:
Straining Defense Move – You can only remove an amount of cards from your deck equal to
twice the amount of Drills your opponent has in play.
EXAMPLE: Player A has 4 Drills in play. Player B uses Straining Defense Move. Player B
can only remove up to 8 cards in his Life Deck with Straining Defense Move because his
opponent, Player A, only has 4 Drills in play. He may remove fewer than 8 cards from his Life
Deck, but he cannot go above 8.