Do you have a save at that point, or just before? It shouldn't be too hard to reproduce, but a save there, or after if he keeps grunting after reloading, could be handy. If so, please email it (or a Dropbox or Google drive link, etc) to supportdos2@larian.com, with a brief description or link to this post.
Each save is a folder in the '..\Documents\Larian Studios\Divinity Original Sin 2\PlayerProfiles\<ProfileName>\Savegames' folder. In Windows Explorer you can zip file(s) and folder(s) by right clicking on it/them and selecting 'Send To | Compressed (zipper) Folder'.
