Managing to get back aboard, the others find that a third Psiren has disguised itself as Lister, leaving them unable to determine who is the real one and forced to hold both at gunpoint. To determine which one is false, the crew ask them to play guitar, and shoot the fake when it plays well, knowing the real Lister is terrible despite his belief that he is excellent, determining the Psiren's illusion was based on this belief that his genuine skill set.
The crew, after successfully boarding again, discover a third Psiren impersonating Lister, leading to confusion about who is genuine and forcing them to hold both at gunpoint. To distinguish the imposters, they propose a guitar performance test, aiming to eliminate the fake by shooting it when it plays well, knowing the real Lister's actual skill level is poor despite his self-belief that he is talented. This strategy exploits the imposter's illusion based on the false belief of Lister's genuine musical ability.