Vergil entered the Kingdom of Witches through the most direct path possible, which, for him, meant crossing a dimensional fold, ignoring three layers of ancient barriers, passing over a labyrinth of defensive runes, and appearing right in the center of Salem as if he had used the front door. In his defense, it was not exactly an invasion if he could get in. At least, that was what he thought during the two seconds of silence that followed his arrival.
Then every alarm in the dimension went off at the same time.
