//讓字彈移動並漸漸縮小，射中後讓泡泡消失
function bulletMove(event:Event): void {
	if (event.target.scaleX > 0.3) {
		
		//一次縮小10%
		event.target.scaleX = event.target.scaleX - 0.1;
		event.target.scaleY = event.target.scaleY - 0.1;
	} else {
		event.target.parent.removeChild(event.target);
		event.target.removeEventListener(Event.ENTER_FRAME, bulletMove);
		
		// 檢查泡泡
		var deadBubble:Object=shotCheck(event.target as MovieClip);
		if (deadBubble != null) {
			deadBubble.removeEventListener(Event.ENTER_FRAME, onFramePlaying);
			bubbleArea.removeChild(deadBubble as MovieClip);
		}
	}
}