What would your ruling be in this situation?

[GeordieGaz]

This was the situation in the APAT Team game on Saturday! I'd lost a few chips and was down to 6k, I'd put about 900 into a pot and the board is reading something like... 4 2 7 K 9... no flush or straight possibilities, I'm holding 6 7 and have called a bet on the flop and it has been checked down since then and is at a showdown. I show my hand (6, 7) and my opponent taps the table says nice hand and puts his cards face down over the line as if to fold..... I then start to rake in the pot and I also ask to see his cards (which I'm entitled to if it's at a showdown) and the dealer turns his cards and shows A 7, this beats my hand with the Ace kicker. The opponent then says... 'so it is my pot, right?', I say well yea it should be but you mucked! Anyways to cut this long story short, we ended up having to get a ruling so I was wondering what you guys think should happen in this situation?

[GB80]

Re: What would your ruling be in this situation? You win. His cards are dead.