You are skilled at bringing your opponent down with you when you are knocked prone.
No prerequisites.
Whenever an opponent successfully uses the trip combat maneuver against you, you can attempt to trip an adjacent opponent as a reaction.
Starfinder Core Rulebook © 2017, Paizo Inc.; Authors: Logan Bonner, Jason Bulmahn, Amanda Hamon Kunz, Jason Keeley, Robert G. McCreary, Stephen Radney-MacFarland, Mark Seifter, Owen K.C. Stephens, and James L. Sutter, with Alexander Augunas, Judy Bauer, John Compton, Adam Daigle, Crystal Frasier, Lissa Guillet, Thurston Hillman, Erik Mona, Mark Moreland, Jessica Price, F. Wesley Schneider, Amber E. Scott, and Josh Vogt.