血债要用血来偿

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.

债 = 亻 + 责 : James II of England (zh) had a great party. He wakes up in the airplane's bathroom (ai4) still wearing his party hat (责) to a very angry Rosa Luxemburg (亻) who wants to claim Jame II's debt (债).

要 = 女 + 覀 : Bessie Coleman shows Maud Younger how to use a knuckle duster in the aorta's bathroom. She says it's very important and that Maud will have to get one herself.

用 = 丨 + 月 : Mnemonic symbol: a first aid kit. Can you see the cross on the container?

用 = 丨 + 月 : Yu the Great hurt her leg when she slipped in the engine's bathroom. The moon helps her to splint her leg using the bathroom's first aid kit and a dinosaur bone.

來 = 从 + 木 : Mnemonic symbol: mailwoman. Sir Lancelot (l) is visiting the mailwoman (來) in the airplane's kitchen (ai2). As a gift, he brought a Christmas tree (木) decorated with rubber chicken (从).

来 = 丷 + 未 : Mnemonic symbol: mailwoman. Lancelot (l) is super happy that his inflatable crocodile (丷) and live size Ai Weiwei (未) puppet finally arrived (来). The mailwoman (来) delivered them straight to the kitchen of the airplane (ai2).

偿 = 亻 + 尝 : Charlie Chaplin (ch) made a very nice dish in the anglepod's kitchen (ang2), but Rosa Luxemburg (亻) messed it all up by adding too many spices. To compensate (偿) for it she has to cook it all again, with Charlie Chaplin warily tasting (尝) the food from time to time.