Yeah, but one of the rules of game theory (in this instance a prisoner's dilemma type game), the two parties cannot communicate in any way and have to make decisions only on guy instinct. Economic theory tells us that humans are selfish and utilitarian (want to increase pleasure and decrease pain), the gut instinct would be to go with foe, that way you are minimising the pain of being swindled, and increasing the pleasure if you manage to end up with all of the cash.
The only real way to get out of a constant foe/foe lock would be with some type of signal which would be genuine and costly to fake, so go figure what that might be
