to do; to engage in / to write; to compose / to pretend; to feign / to regard as; to consider to be / to be; to act the part of / to feel (itchy, nauseous etc) / writings; works
誓
=
折
+
言
:
Sherlock Holmes (sh) announces a pledge (誓) using a megaphone (言) in the space station's bathroom (Ø4) that he'll never use his folding knife (折) to hurt anyone.