public void whenCrash(){
      stage.gauge-=gaugeDamage;
      stage.grade-=damage;
      if (stage.grade>4.5) stage.grade=4.5;
      if (stage.grade<0.0) stage.grade=0.0;
      stage.hit=true;
      if(grade=='f'){
         stage.impact=true;
         stage.impactx=(int)stage.player.x;
         stage.impacty=(int)stage.player.y;
      }
   }