"Nemo," he says, looking up at you, slightly lowering his sword. "I don't know what's going on here, but the Tercera's Fraccions tried to... It doesn't matter. I was worried I couldn't do it alone, but if you help me secure them until Ulquiorra arrives, I won't need to..."
Aww, look at him. He's so happy he won't have to kill his rebellious allies.
A shame about the real reason they'll survive.
"Then why?! For that dead godling-" he says in anger, sweating and off-balance, and finally he overextends himself in desperation.
Oh Tesla, honey... Nemo told you. She already told you how she ran away from one fight, which killed your first Master, and you already saw how she was
the catalyst behind the loss of your second. This really shouldn't be a surprise for you at this point. Her best friend is Luppi, after all.
For what it's worth, I hope you and your Master somehow make it out of this war alive. Not sure how, but more impossible things have happened.
[X] Finish the job. Get Zangetsu to Ichigo, even with Ulquiorra on your heels.
I don't think it has even been confirmed that Barragan is definitely and officially on our side, and if any part of him is wavering, running to hide under his breeches could very well push him in the wrong direction.
I prefer to minimize the odds of having two Vasto Lords on the enemy side, thank you very much.