Alright, this is it. You're facing the boss, and it's a big one. He's charging up an energy attack, just getting ready to launch it at you. What do you do? Do you dodge out of the way? Block with your shield? Scream like a little girl? Sometimes, the boss will let out a different energy attack that can't be deflected. If you hit that projectile, it'll probably explode and you'll be damaged. Incidentally, it doesn't really count as Playing Tennis if the boss's light-based energy projectiles are simply reflecting off your Mirror Shield - reflecting the attack must require timing and reflexes.