In truth, with Baros's mastery of the Dragon Elephant Prison-Suppressing Scripture, he could have forcibly suppressed the Spacetime Turbulence and the Universe's temporal corrective force just now, keeping Goku Black trapped in this Universe.
However, considering that a full-force battle between experts at the Divine Limit could unleash enough destruction to wipe out an entire Milky Way Galaxy in an instant...
Baros had watched Goku Black leave with his own eyes because he intended to make Trunks's Second Future Timeline the battlefield this time.
After all, Trunks's timeline was one where the entire Universe had nearly perished, and all the Gods of the Twelve Universes were dead. No matter how terrifying the battle became or how many galactic star systems were destroyed, no one would step forward to interfere.
Such a battlefield was truly hard to come by.
Of course, most importantly, that entire spacetime dimension contained twelve nearly ownerless Universes without Gods of destruction, with the Angels dormant. Baros had great use for them!!
Upon hearing this, Bulma neither threw a tantrum nor asked Baros to take her along to see that ruined timeline. She merely nodded lightly and walked over to Tights's side.
After giving it some thought, since he had already brought Kakarot and Gohan, a few more would make no difference.
Then, while still in Super Saiyan 4, Kakarot used Instant Transmission to directly lock onto the ki of Bardock and Broly, who were still in the North Galaxy clearing out the remnants of the Galactic Patrol Alliance, and brought them over.
The moment they arrived via Instant Transmission, Broly and Bardock dropped to one knee before Baros and reported, "Great Emperor, Broly and Bardock have not failed in our mission. We have destroyed the entire Galactic Patrol Alliance headquarters and are currently exterminating the remaining