From before HammerFall. Jens plays really good here. Totally improvised. Great phrasings and scales, modes and speed beyond anything else out there.
Not one note wrong out of all those improvised notes at that speed! Who else can do that?!
Notice how the guys from Sonata Arctica, Nightwish and Children of bodom took Jens keyboard angel. I remember when Jens started to do this. It was on a tour in Germany with this band. He made a stand out of a couple beer cases. It was because it's easier to play fast and relaxed with your fingers in a more natural position.