Form has 2 signature blocks, but only one is needed

If you send a form for someone to sign via Adobe Sign, and they indicated some changes, can they send it back without signing it?  I have a form that needs a signature that the person approves it, or a signature that they need some changes, which there are comments boxes to do that, and another signature box to indicate they understand that a final version will be sent to them after completing those changes.  If I send it via Adobe Sign and indicate two signature areas, if they only apply one signature to say they need changes, will the document come back to me, or it will stall as they only applied one and not both.