血祭

血 = 丶 + 皿 : Mnemonic symbol: blood transfusion.

Xu Xian hurt himself and needs to get a blood transfusion in the elevator's bathroom. He found a petal leaf as donor, which is bleeding droplets into a bowl; Xu Xian gets the blood from the bowl as infusion using some tubes.

祭 = 又 + 月 + 示 : The moon (月) decided to visit the space station and meets Joan of Arc (ji) In the space station's bathroom (Ø4). Joan of Arc is full of awe, so she decides to give the moon a sacrifice (祭). She sets up the ceremonial standard (示) and, chanting mysterious songs, sets fire to her favourite boxing glove (又). The moon is quite satisfied with the offering.