Very interesting rules question. What do you do?

[Grease]

OK, here's the deal.

A few people limp, one raises, SB asks who made the raise, when the dealer went to motion whom, he knocks over two cards. The top card (flop burn) remains unexposed and no one sees, but the bottom card (would have been flop) is exposed. SB hadn't made up his mind and there were players left to act. What is the ruling on this?

I wasn't in the hand, but I find this really interesting.

[AngusThermopyle]

1. How do you "knock over" two cards?

2. Put the deck back together(excluding mucked hands) , shuffle and cut. Then do the flop.

[Grease]

The dealer knocked them off the top when he made the hand motion to indicate the raiser. I had never seen this before, so I was lost.

[JKDStudent]

Robert's Rules of Poker

4. If the flop needs to be redealt because the cards were prematurely flopped before the betting was complete, or the flop contained too many cards, the boardcards are mixed with the remainder of the deck. The burncard remains on the table. After shuffling, the dealer cuts the deck and deals a new flop without burning a card.