I think it's more to do with them not showing variety of attacks/spells and enemies more than anything, just a bad cut they decided to show for whatever reason, I guess it's more like they want to focus on the exploration and the scale than combat, while the last trailer shows a bit more on action/scripted sequence and the teleporting.
We'll probably need to see actual gameplay demonstrations or longer non story related videos to see how it all comes together. This video shows just AIs stumbling around and doing nothing but a few slow slashes lol.