The condors seem pretty reasonable, we could just volunteer our crimes up front.
"So, the pangolin boss tricked us into thinking you'd blocked off their access to an important religious/diplomatic site, and they needed ways to defend themselves against your aggression. By the time we discovered the truth, we were beholden to a superior who ordered us to continue the arms deal. That person is now no longer our superior. The pangolin summoner and I cut the deal off, and would dearly like to help the Condors regain what was taken from them, if possible."
It skims over some details, but is broadly speaking correct, and if they discover the truth later and feel we lied to them, then that could make future relations untenable. Otoh, now, in a trapped cave entrance, where we can unsummon, where we've only just made contact, might be the ideal circumstances to come clean.
"So, the pangolin boss tricked us into thinking you'd blocked off their access to an important religious/diplomatic site, and they needed ways to defend themselves against your aggression. By the time we discovered the truth, we were beholden to a superior who ordered us to continue the arms deal. That person is now no longer our superior. The pangolin summoner and I cut the deal off, and would dearly like to help the Condors regain what was taken from them, if possible."
It skims over some details, but is broadly speaking correct, and if they discover the truth later and feel we lied to them, then that could make future relations untenable. Otoh, now, in a trapped cave entrance, where we can unsummon, where we've only just made contact, might be the ideal circumstances to come clean.