You are the one who is responsible to the lender. The negotiator may want additional information. They may have questions they want to hear your answer. They may have concerns about the party negotiating on your behalf. You may want to consider having a conference call with your negotiator along with your representative, be that your agent, attorney, or short sale negotiator.
i had one negotiator who wanted my client to pay outside of the escrow. They ask for money up front. It was very shady. Everything should go through escrow and be shown on the closing statement.