Playing a new character through the expansions. First time meeting Heskal on Asylum for some reason the conversation after beating him in combet bugs out and his character model disappears from the trial chamber.

It happened both the first time, when Valkorion gives you the option to use his power and after you fight Heskal a second time after refusing.

I fixed it by galaxy map-traveling to the fleet and resuming the chapter, which respawned Heskal both times.

Reporting the bug so others that happen upon it has a solution and because the bug really takes you out of your immersion.