During "Missing son" witcher quest in Skelligge there is an exploit a glitch and a bug.
The mission wants you to beat some sense in the fiend and when it has enough he hypnotizes you, runs away and you have to start over again at the new location (since it can regenerate).
I couldnt be bothered by it, so i found a workaround to avoid being hypnotized.
The exploit
When you are horse riding you cannot be hypnotized, but the horse gets scared. The hypnotization works on a radius ad by line of sight (meaning it wont work if there is an obstruction between you and Morvudd). If you engage Morvudd riding Roach and hitting it, and when you are knocked back you just run in order to get back on your saddle you can stay indefinitely on the castle yard where you first meet Morvudd without relocating. You can also get back near the body of the missing son in order to save if you are in a good point.
The glitch
Also, if you get hit by Morvudd ther eare chances that you wont get wounded at all, just knocked off Roach.
The bug
Problem is, as soon as you kill Morvudd and collect your trophies and loot, the game locks in an infinite loading screen and wont go on, all you have to do is ALT+TAB and close the game. The mission doesnt tell you that you have to relocate elsewhere in order to finish th mission, even though it has been certainly scripted that way, but i guess it needs to be patched: either you have to get hypnotized while horseriding, or fix the chance that you can end the mission on the castle yard.