Hi,
I know I'm way late to this response, but i encountered this as well. Here's how I solved it.
Like everyone else, I have 2 main characters. Main Character 1 struck the final blow on Leandra immediately leading to the dialog mentioned above. That's when this bug occurred. Eventually, I figured out that the person driving the dialog was Main Character 2. I switched to main character 2 using the corresponding F Key. Then the dialog worked.
I'm guessing Darthgrimm got by it by landing the killing blow with the same character that triggered the dialog, thereby not requiring switching the controlled character to get through dialog. Hope this helps someone.
Cheers,
TatsumakiJim
