This issue has been reported a handful of times before, and normally teleporting a character out of the pit (in the developer build of the game) will trigger the dialogue as if a character not involved in the initial encounter had arrived, and combat would proceed normally. Leaving a character out of the initial encounter and actually interrupting should work, as well (I've tested that a couple times), but in this case the extra characters and/or mods may be interfering with that workaround.
I replied to your support email.
