Vergil's grumpiness was something unpleasant at first, but it soon became almost funny. His attitude towards you was condescending, especially considering that he agreed to teach you.

It was spontaneous. Maybe after reuniting with his family, maybe after Nero's influence, but Vergil really changed. In the end, he even turned out to be a good mentor.

"Hmm... No, that's no good," he snorts, frowning slightly as he watches you desperately trying to handle the katana. He is behind you in the blink of an eye, carefully adjusting your position and taking your hands in his.

"Imagine that the katana is an extension of your arm," he breathes hoarsely into the back of your head, "A part of your body, not just a weapon."

Maybe this training wasn't such a bad idea... Especially considering how Vergil tries to teach you everything he knows.