Gallagher- I think you got the group of 8 droids mixed up. They're southeast, firing on Andro and co.
So Xeth is going to step out of the computer area again (going east) and fire his grenade launcher directly into the middle of the southeast group of droids, drawing their fire off the embattled Andro and Argo (and cowering Denzral) and taking out some of the droids.
Keep in mind as you're coming into the inner area that it's 6 Jedi to an area before we're too crowded to move through... looking at the Vera/Aurel/Gallagher gang.
"Jelena, make it quick," Xeth says before stepping into the corridor. "My giant explosions are needed." He raises the launcher and swings right, plugs away a grenade or two into the dark corridor, toward the noise of clanking droids and laserfire.