国师

国 = 囗 + 玉 : Mnemonic symbol: a nation's flag. Let's say the Chinese flag.

In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.

师 = 刂 + 帀 : Sherlock Holmes' teacher shows Sherlock one final trick in front of the space station before his training is complete. The teacher shows Sherlock how to electrify a kitchen knife using a defibrillator.