i don't play much 2-7 but i think in this situation i make a bet at the end. first reason is because he drew on the third draw, chances are huge he missed and if we can take the pot down with a bet we win without having to show our cards. second reason is if he made his hand he would probably lead out to induce a raise, or at least get a call. you've shown you are willing to go with your hand by standing pat after the first draw so he knows you're def not folding if he bets. it just seems like villian would be missing out on value if he checks, unless he was expecting you to bet like almost al