Gittin 11: Benefit to Others in Their Absence

More on non-Jewish involvement in divorces and other documents. Rava introduces an example specifically with Persian non-Jews, but did Jewish witnesses know the Persian to be sure they're accurate? Indeed. How to ensure that the documents can't be forged? Also, at what point can one who's giving a get retract the document? For divorce, it's possible to do, but not for freeing a slave - where the shaliach accepts the document on behalf of the slave, as it's to the slave's benefit. But divorce is not automatically to the woman's benefit, so the shaliach doesn't accept the document on her behalf when she's not present.