Shrinking a healthbar

Okay, I’ve got a healthbar that shrinks everytime a character is hit when an object becomes larger than a certain size. This is in an enter_frame, basically the healthbar shrinks every frame, when I want it to shrink ONCE and then stop until hit again. I used a boolean value set to false to control it so I thought. Argh.

collisionOne is a boolean that = false;

//This is in an enterframe event.
for(var e=0; e<boxArray.length; e++){
if(boxArray[e].scaleX > 2){
                            if(! collisionOne){
                                trace('collision One');
                                hbar.width -=5;
                                collisionOne = true;
                            } else {
                                collisionOne = false;