1. Use the Aard sign
2. *stunned*
3. Watch animation of Geralt chopping its head off
IIRC, the stun effect wasn´t guaranteed and wouldn´t fire at all if you haven´t leveled up the sign enough. Regardless, while I think the encounter itself was alright, the setup wasn´t - the rest of the world was locked out by then, retrying the fight required clicking through a relatively extensive dialogue segment and the encounter moved time to midnight which could mess with potions if one hasn´t used foreknowledge and meditated to right before.
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When it comes the combat in both Witcher games, personally I think neither game got its formula quite right.
I didn´t mind that in the first game the action aspect was more-or-less boiled down to rhythmic formality since I accepted its system to be more grounded in the preparation and general RPG side of things, however due to a fairly linear skill tree and the way signs were spread out through the game the character system didn´t offer enough build options to offset action simplicity.
In comparison, the skill selection in the sequel was more open and featured more unique abilities, but that got quite significantly offset by grounding the combat more in the action side of things which diminished the importance of skills and at the same time, in my opinion, wasn´t particularly engaging to stand on its own AND due to balancing from chapter 2 onwards it pretty much became the same clicking experience it was in the predecessor anyway.
Regardless, since neither game is particularly combat-heavy, few sections aside, I´ve found the combat experience provided in both to be ok/serviceable and certainly not lackluster enough to diminish my enjoyment of the games´ other qualities.
Personally I´ll be surprised if The Witcher 3 delivers a markedly improved experience in this regard and I very likely won´t mind if it doesn´t, unless the combat ends up consuming too much of the overall playtime.
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As for the article, haven´t read it but I do remember the game´s lead quest designer preferring Fallout: New Vegas and Gothics to Skyrim, as far as open world games go, which gives me hope The Witcher 3 will be different from Skyrim in the ways I think it should be as a Witcher game.