[Video]
[He's a little off his game today, but not entirely. Occasionally someone will come in with an aura similar to a vampire--but not exactly. Sort of like Kaien Kurosu...and likely himself in the past. The day of new arrivals, Zero tends to go looking for vampiric individuals and so has probably identified you as someone of interest without speaking to you.
That being said, he won't be showing a single sign of recognition to give any of that away. Instead, he takes a different tactic.]