I know it can be hard when you are trying to get an offer an the clock is ticking loudly behind you with a pending auction date. Don't let your sense of urgency override your responsibility to your seller.
I see so many Realtors uncomfortable with advising the seller to counter the offer made by the buyer on their short sale listing. In the end it is your seller's choice but don't scare them away from the process of negotiating the price and/or terms of the offer. Remember that a lower offer approved by the seller's bank may potentially mean a larger exposure to the balance of the debt if that same bank decides to come after the owner for the balance at a later date.