Source: Starfinder Core Rulebook p.97
For your debilitating trick, you can attempt to knock the target out in one blow. The target must succeed at a Fortitude save or fall unconscious for 1 minute. Once you've used this ability to attempt to knock a creature out, that creature is immune to your knockout shot for 24 hours. You must have the staggering shot and stunning shot exploits to learn this exploit.