I left the game running for awhile with the second cut scene hung. When I came back, there were three error messages saying a scene had not ended; though I then had control of the character (without screen focus) and clicking in the room with Zandalor had him run there (the orcs were neutral and showed up green on the mini map, and Zandalor was unresponsive). Once in the room, I could use the shift key to move the screen focus, which returned it to being centered on the character. After talking to the treasure room door and returning to Zandalor, I could talk to him, but the only speech option was to ask to be healed.

After hex editing, the character's first move triggers the second cut scene, but with the same hanging results.

Swapping data.000 files between this save and a known good save resulted in the copy of the problem save working, and the copy of the good save hanging at the end of the second cut scene. This means the source of the problem is in the data.000 file, in which case file swapping will not help. I tried anyway, but on restoring the original data file, Zandalor and the orcs are missing (with that data file, the cut scene which brought them there was never triggered).

If you don't want to start over, I have a save of a level 31 male warrior at that point in the game, with the majority of quests in Rivertown and Verdistis complete and the Rivertown sewers cleared. Kiya played a wizard, and may have an old save before rescuing Zandalor.