"Elf... Did you happen to time travel?" He picks up the mask again, and connects it to the canister. Turning a valve on the latter just a hint leads to a faint hiss, and he places it over Taako's face, even if he has to hold the wizard's head steady to do so.

"Elves don't exist normally in this time or place, you see. I'm not going to pass up this opportunity to examine you." Already a faint euphoria will be creeping over Taako as the gas - not enough to put him under totally, because that's too much of a risk, but enough to distance him significantly from the pain he's about to experience - takes hold.