Turn raise size...

[Peter Harris]

we need to know how likely you figure the FD to be. If you are more than 20% sure it's out there, better to lay 3-1 on the pot to make it a FTOP error, rather than price villain in.

In order to shut out odds for the draw, present or not, i'd raise $18 (to $25) into the $27 pot, making villain pay $18 to win $52, just under 3-1.