[Asakura's got his back turned to the mirror as he gives a lazy wave goodbye. As much as he'd like to see that look of outrage, he needs to get out of there without landing on the receiving end of The Stare again.]

Even if you could get in here, you wouldn't last long.

[Which is the truth, even if the tone of his voice makes it sound like he's just being an ass about it. If you're not a Mirror Monster or a transformed Rider, getting into the Mirror World is a fatal one-way trip.]