Unfortunately for you, I can't develop such a skill in seconds. [He shrugs, feeling utterly blameless after he just sat and watched.]

I saw you drink the black tea. [And he starts to write as he talks, gaze drifting to the page.] Once you set your cup down, a small fragment of your face flaked off. Based upon the reflection of the light, it's a piece of metal. Since your fingers have also begun an abnormal creaking sound, it seems that the tea has caused some sort of alteration to your body changing it into another material.