Sorry surviva316, maybe I'm not explaining myself well. I always thought you should make a commitment decision as early as possible. Subject to change with more intel when your putting 10% plus of your stack in the pot, 12.5% to be extact, but I'm estimating. Please correct me if i am wrong.
Commitment threshold is when the pot is around 1/4 of remaining short stack money. In this case a little less than 6 dollars. By making the 2.90 cent bet he will be crossing or on the verge of this threshold.