I guess Kei regrets to have come along by now. Or that they didn't just take the elevator to the upper floors. ^^;

Still protesting, the android gets dragged back into the lab...

Android: "Noooooooooooooo..."

...and Shoutarou slams the door shut. Finally, Taku helps the exhausted Kei to get back on his feet.

Taku: "He didn't even notice us, did he?"
Kei: "T-This is worse than I had feared and we haven't even seen the mirror yet..."
Taku: "Come on, we're halfway there."
Kei: "Right..."