Appearance/discussion of Necropolis units.

Where have you seen a samurai with a giant two-handed sword?

Samurai already had a two-handed sword (maybe not giant, but...), otherwise how could they cut down enemies? In Warcraft, the Blade Master has a two-handed sword, and when he attacks, he even jumps.

But in general, yes, in Heroes of Might and Magic III, the vampire attacked with his hands.