I've managed to persuade the Githyanki to leave me in peace. And I had Lae'zel in the party (she rushes off to talk to them). I just got her to lie to the dragon rider about their purpose and not tell the truth (and passed a Persuasion? check). The problem is then that there is no dead Githyanki and no breastplate drop to lead to the location of the Creche (that I found out about later on a bg3 wiki) - but I believe this happens in Act2? so outside the scope of the EA in this case.
yeah, you can speech check your way out of the fight. You do miss out on some amazing weapons, armor and the location of the creche, but maybe that becomes available later.
