Professor Luske
The dealer did not immediately muck the hand. Luske and the dealer explained to the player that in order to be entitled to half the pot, he must open his hand, regardless of whether he's playing the board. A floor was summoned to the table who made the same ruling. Since Luske's opponent's cards were still clearly identifiable near the muck, the floor opened the hand.
The floor instructed the player that a future dealer may not be so kind as to not immediately kill the player's hand and to table his cards if he wants his share of the pot.