Hmm.... I think they are allies, but secretly enemies planning an ambush behind each other's back, and waiting for the right moment to sneak up on the enemy and stab them in their back when they arent looking. Then the one stabbed will do this dramatic, time-slowing fall like in the James Bond movies, and hit the floor like 'NUUUUUUU! I TRUSTEDD YOUUUU.....' and yeah. Then they die, slowly, and painfully, while the other one is standing above them immitating this creepy evil laugh before ending up coughing themselves to death.