供血

供 = 亻 + 共 : Gitta Giraffe ((e)ng1) is donating (供) blood in front of the engine ((e)ng1). Rosa Luxemburg (亻) draws the blood and the communist (共) stores it.

供 = 亻 + 共 : Gitta Giraffe (gu) is being interrogated by Rosa Luxemburg (亻) and the communist (共) In engine's bathroom ((e)ng4). Rosa and the communist want to squeeze a confession (供) out of Gitta, so they use the water boarding (供) technique.

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.