re: Poker & What's the best defense against the continuation bet?
1. Reraise it PF and take it down there (if you can). Or at least get some more information on the strength of your opponents hand.
2. Depending on how loose your opponent is and the range of hands he could raise with, this is a perfect opprotunity to float. His C-bet of 2/3 the pot size is a bit big if he is holding a jack because he is losing value for his hand if you fold. Its possible he could be holding A8 or mid pair like 99. You wouldnt want to reraise at this point because there is the chance of you be reraised* and you'll have to fold. So, just call the bet. If your opponent bets on the turn, give him credit for a hand-not necessarily the J-and fold. If he checks the turn and the river, make a (value) bet of about 1/4 the pot on the river to represent the Jack. Fold to any reraise.
*If you do reraise here and they 3-bet, the yeti theorem comes into play. Which is 'A 3 bet on a paired board is almost always a bluff.' The reason being is because they lose value if they have trips or a boat if they 3 bet you. And if they have less, like mid pair, its very hard for them to call a reraise, let alone 3-bet. However, considering your stack sizes compared to the blinds, you'll be risking a large percentage of your chips with a reraise (if you have to fold). So, I think floating would be the safer route to take because you dont risk as much, but can lay it down as easily.