When conventional methods proved ineffective, it was extremely difficult to eliminate Participants with superhuman physiques without leaving a trace. Aside from using immensely powerful or large-scale weapons, Participants could also be used against other Participants to kill them. However, the latter approach was impractical as well; there were too many uncertainties, so Cruze had not considered it.
Furthermore, when making a move against these Participants, it was necessary to ensure they were not inside their own units. No one could be certain whether these Participants possessed something like an emergency Ejection Device. Even if their units were destroyed, they might be teleported to a safe location the instant of destruction, escaping pursuit and becoming loose ends who could reveal everything about this mission.
Within Prometheus's vast marketplace, there were no escape items capable of fully active teleportation, nor were there escape items that could be used outside combat without relying on a unit. All escape items were passive or semi-passive. Most importantly, they had to be used in conjunction with a unit in order to function as intended. There was also one minor restriction: they had to be used with one's own unit.
Simply put, if a Participant encountered danger while not piloting a unit, they could only rely on their own abilities to escape and had no way to use any escape item. However, if they were piloting their own unit and a team member's unit was destroyed in battle by an enemy, the bound escape item could teleport the Participant away at the instant the unit was destroyed, allowing them to escape danger.
In other words, if they wanted to eliminate these Participants, the best choice was to kill them directly while they were not piloting their units.
Additionally, although Prometheus erased each Participant's memories after a mission