送還

送 = 关 + 辶 : Mnemonic symbol: a delivery girl.

Inside of the engine's bathroom, the delivery girl gave a parcel to Susan Saint Bernard in passing since she can't stop her new electrical gladiator sandals. Susan Saint Bernard recognizes her demise and uses her spider-superpowers to push the off button of her sandals so that she can rest for a while.

还 = 不 + 辶 : Hamlet sees an early exhibit of king Leonidas' gladiator sandals in the airplane's kitchen. However, the exhibition is still not set up but in the progress of being set up, so there's a big sign showing that it's forbidden to touch the sandals.