Best cash so far..

I know it's not alot, but it's my first cash over $5. I played in a $3+$0.40 NL sit and go that ended five minutes ago. I took second and won $21.60. I had a $10,000 chip lead with five people left, then the guy who won went on a knock out spree and knocked out the remaining players. So it's heads up and he has a 3 to 1 chip lead. Couple back and forth raise and takes. Then he raises my big blind. I push with A 7 suited. He makes the call. Turns over Q 4 offsuit. I was stunned and of course you know what happens next. He flops a set of fours then turns a queen for a full house. Makes no sense for him to do that. He loses the hand we're almost even money, him with a slight chip lead. Oh well, still happy to take down second.