Re: 2-7 TD 0.50/1.00 - line check
 

If he C/R after second draw I think you need to discard 8 almost always. You can't get rid of the 7 IMO because you may have more outs on average, but you are also drawing to a hand which has little showdown value, given the action. Draw to a 7, and if you miss, then alright, you saved a bet.