凝血酶

凝 = 冫 + 疑 : Someone ate one of Nefertiti's (ni) popsicles (冫) and now she rounded up her suspects (疑) in the engine's kitchen ((e)ng2). To make things easier she congregated (凝) the suspects into a sticky mess using the rest of her popsicles.

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.