Forum:Dark hole?!? WTF?

OK so I'm getting my game on (lol nerd) and my friend tributed a monster but befor he summoned his monster he played dark hole, killing all my monsters, then summoned the monster?!?!?! i told him no way in hell that can be done? so what you think?

Right                    Wrong?

Main phase I

Tribute                    Tribute summon monster            >dark hole< Summon Monster? --- battle phase

So WTF? someone wanna tell me if you can do that?