失血

失 = 𠂉 + 大 : Sherlock (sh) locked himself out of the space station (Ø1)! He lost (失) his key (𠂉)! After he was floating in front of the space station for an eternity, a robot (大) came by with a lost+found box (失) which contained his lost key.

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.