Dealer turns up Ace of Spades, and he calls Spades trump and goes alone, picks up the card. First person leads an Ace of Hearts. Second person passes (hand played alone) and third person (doesn't have a heart) so throws a King of Spades. Dealer has to play a heart, instead of over trumping third player. Dealer says 3rd player is wrong to Trump first players card, because it was overtrumped their partner.
Dealer says that 3rd player should have just thrown off, something else.