He grunted affirmatively. "Good. Then jou will not need this to help jou breathe the thin air of the surface lunar. But jou, unicornio..." Raising a forehoof, he pointed at Lily and then the bubbling pot. "...Jou did need this, or else jou would very quickly have found jourself exhausted and short of breath, or even feeling as if jou are suffocating. The air is not plentiful, on the Moon. Here in the Halls it is not so bad, because we are deep underground. The Crater is not. The drink I have given jou opens up the blood vessels." Sniffing, he tapped her on the chest. "It takes effect quickly but lasts only a short time. If jou feel uncomfortable afterwards when we return, jou must tell me so immediately."