Star Trek Discovery: Every Easter Egg & Hidden Reference From 'That Hope Is You'
12. Suus Mahna
The contentious meeting of Michael and Book begins as a fight in which Burnham whips out her old Suus Mahna moves, first introduced in the episode "Context is For Kings" and later seen in "Lethe".
This ancient form of Vulcan martial arts originated in the Star Trek: Enterprise episode "Marauders" in which T'Pol taught the crew of the NX-01 to fight like Vulcans.
Suus Mahna was last seen in Star Trek: Picard's season finale, "Et Arcadia Ego Part 1" practiced by the Synths at Coppelius Station.