Of course as with any at-bat, it depends on the situation. If the game is still in question, you just need to pitch as the situation dictates. If the game is no longer in doubt, there is nothing wrong with pitching to him again, or if you chose walk him. No one ever seems to think about a pitcher striking out a bunch of kids as embarrassing the opposition to the point something needs to be done, and I don't think that's any different than a hitter having a great day. The odds of a kid hitting a fourth homer are astonomical enough, and the possibilty of hitting five is even less likely. The kid doesn't need to be punished for having a great game, and a coach is not lacking class because he allows his hitter to try to do soemthing special. No pitcher should ever throw at a hitter in HS Baseball, and I don't think they are doing it either, not even in the vaunted SICA West. They don't even do it in the Major Leagues most of the time.