According to wronging rights, Pol Pot’s nephew is refusing to testify before the tribunal due to commands from “The Iron God”, which sounds like a deity that the Greyjoys would worship. And the official oath witnesses take is even better. An excerpt:
If I answer falsely on any issue, may all the guardian angels, forest guardians and powerful sacred spirits destroy me, may my material possessions be destroyed, and may I die a miserable and violent death.
“Valar morghulis.”
looks like dad beat me to it