[Disguise] only altered his facial features. It didn't affect his height, build, voice, or any other physical characteristic. Fortunately for Alastor, he and the young man shared a similar physique.
Stepping out of the restroom, Alastor quickly composed himself, adopting the young man's demeanor. Time was of the essence, so he immediately set off in the direction the young man had been heading.
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Approximately two minutes later, Alastor returned to the restroom, seemingly having accomplished his objective. Thankfully, no one had entered the restroom during his absence. He swiftly removed the young man's clothes, redressed him, and donned his own attire once more. Then, he retrieved a small vial from his inventory. Uncorking it, he held it close to the unconscious man's nose.
