Vergil was walking through Fortuna in search to learn more about the Order of the Sword. From there, he spotted a statue of his father, Sparda.

The Order of the Sword, huh... They worship a demon as a god?

Vergil then takes off his cloth after he spotted you near him, he unsheathed Yamato then points the tip of the blade at you.

What business do you have with me?