Qi'ra has a throwaway line after taking down the Pyke Syndicate member in a closed room as L3 watches. She mentions that her fighting style is Teräs Käsi, and then the scene ends like that is supposed to mean something to us. If you owned a Playstation in 1997 and were unlucky enough to rent or (god forbid) buy the ill-advised Star Wars fighting game Star Wars: Masters of Teräs Käsi, that reference was for you. The game was a 3-D fighter Tekken rip-off where you could choose your character from Arden Lyn (since deleted EU character), Boba Fett, Luke Skywalker, Han Solo, Leia Organa, Chewbacca, Thok (a Gamorian guard), or Hoar (a Tusken Raider, and, yes it is pronounced "whore"), with some unlockable characters, including Darth Vader, a Stormtrooper, Leia in a metal bikini (very impractical, it seems), and Mara Jade, the now-deleted wife of Luke Skywalker. The game was poorly received by fans and disappeared into obscurity. Teräs Käsi's first mention comes in the Shadows of the Empire novel, released a year before the game in 1996. In the Legends continuity, a couple of different characters practice the hand-to-hand combat style, including Darth Maul (as revealed in the Legends novel Darth Maul: Shadow Hunter). Since Solo ends how it ends, we can probably assume Maul's knowledge of Teräs Käsi has been re-canonized and passed down to Qi'ra.