SU-2 takes the chameleon they have prisoner out in a sealed van in order to track down the chameleon which is on the loose. However, since the van is sealed and the only air in comes from ventilators, the chameleon's ability to track by scent would be useless. Further, since the compartment has no windows and the chameleon prisoner can't see where he is, he couldn't have been guiding the team by means of pre-planned directions.