This sounds like a change needs to be made to the Template workflow by either re-ordering the Recipients or adding a additional Recipient. From the initial post there is a document already signed which is then sent to Signer 1, who fills out a text box and signs, hence completing the envelope. If you want to review that text and be able to reject or make changes then I suggest the following in the workflow....
Create envelope, add attachment or use Template already containing a signature. Set workflow to:
1) Recipient 1 - fills out text and signs
2) Recipient 2 - fills out Initials next to the text box hence reviewing and approving the text. Otherwise you would either void or use document Markup (or comments) to negotiate final acceptance.