A decision no one has acted on yet is still just an opinion waiting to be broken.
Consent spoken out loud starts decaying the moment the room quiets, so the gap between agreeing and doing gets closed by the body while the emotion is still hot. The gesture installs what words only described, setting a state from which the mortgaged fields go back.
What keeps it from being renegotiated is a sanction placed outside the assembly. Yahweh is named as the one who empties the defaulter, so the belief carried home is that the promise is enforced with or without witnesses, and that belief sets the state in which keeping it reads as identity rather than loss. Leave the site of a decision with nothing enacted and the insight survives while the years it was meant to buy do not.