内部方法影响外部循环

public function collide():Boolean {
            var tanks:Array = Global.tanks;
            
            // collision detection between bullets and tanks
            for (var i:int = tanks.length - 1; i >= 0; i--)
            {
                // tanks won't hit themselves
                if (sender.id == tanks[i].id || sender.type == tanks[i].type) {
                    continue;
                }
                if (new Point(global_x, global_y).collideRect(tanks[i].getRect())) {
                    
                    // check tank's hp points
                    if (tanks[i].hp > 0) {
                        tanks[i].hp -= this.damage;
                    }
                    if (tanks[i].hp <= 0) {
                        if (tanks[i].type == 'enemy_tank') {
                            Global.current_enemies_num--;
                            // gain experience
                            (this.sender as AllyTank).gainExp(tanks[i].containing_exp);
                        }
                        
                        tanks[i].remove();
                        Global.dying_tanks = Global.dying_tanks.concat(tanks.splice(i, 1));
                    }
                    
                    return true;
                }
            }
           
...public function collide():Boolean {