When a character freezes, saving the game and reloading should unfreeze them.
The main cause of this was fixed in the last update, but a couple of other people have reported this still happening, in both cases when entering combat IIRC.

If this happens again (since it doesn't sound like you tried a save/load) please email the relevant saves (or a Dropbox or Google drive link, etc) to supportdos2@larian.com, with a brief description of what you were doing before the character got stuck.
Even better would be a save before this happens, with a way to reproduce the problem, though at least so far nobody has reported a reliable method to trigger this. A save after it happens will at lease provide information about the state of everything at the time it was triggered, which will hopefully help in tracking down the cause.

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 (zipped) Folder'.