Another thing you might try is using a set of hemostats or feeding tongs and jiggle a piece of worm close to him/her they like action and seeing something smaller then them move basically triggers thier curiosity and feeding responses... Or even if it attacks a worm chunk out of fear it wont be bad for it and then it would at least have the taste and somewhat of a feel for it in its mouth...

But dont dig through fishing tackle and grab old used hemostats... make sure they are clean and sanitary... wouldnt want the little thing to get sick!