I have played it through many times, and I have never avoided the fight. If there was a way to easily avoid it the whole thing would make more sense.
Another thing that bothers me is when (or if) you win the fight, why is there no discussion of the "weapon" the githyanki seek? It should be clear to all after Shadowheart revealed what she was carrying that they are actually in possession of said weapon. Would it not be natural for Lae'zel to demand that Shadowheart hand it over, to satisfy the demand of the githyanki? Yes, there is probably a reason why parting with the artisfact would ruin the story, but still, some conversation on the topic would be natural.
