I've freed a master swordsmith from his cage in a "Person in distress" area, near Mulbrydale, but he doesn't move and I cannot talk to him (I'm not even prompted with the "E Talk" tooltip).
I've tried everything I could think of: look for a quest that would be necessary to talk to him, close/open the door, look around for a last pirate that should be killed, meditate, reload, restart the game, etc.
Also when I leave and come back to the Velen area, this red glowing unsent letter (that I already had in inventory btw) appears on the floor,but it doesn't unlock anything.
Did I miss something, or is it a bug and I'll never be able to talk to him ?
Note: I'm currently playing on version 1.11, on GOG Galaxy.