Tough lesson learned re: mucking after showdown in a B&M game

[Scorpion]

I was playing 1/2NL at Foxwoods the other day. On the button with 6h 7h. Flop is 10s, 5h, 3d. Checked to me and I check, I began thinking what cards give me a draw, any heart, any 8, 9,.....

The next card is a 4c and before I know it 2 people are all in for +130 and I prepare to fold my rags! One of the all in guys sees me and says "hey it's not your turn" Now I hadn't mucked out of turn, I was just showing all signs that is what was about to happen.

His comment though made me look at the hand again. That is when I realized I held the nut straight. Thanks to him I called and it held up against slowplayed AA preflop and 55 on the flop.