Many Buyers use the Building Inspection as a basis for starting a new round of negotiations regarding the price. You don't have to budge.
Did they like what they found regarding the Septic, Chimney and Termites?
If they now want to pay less than you're willing to accept, then you may just lose them. Trying to force a sale under these conditions is not worth your effort; but you can seek the advice of an Attorney in your jurisdiction.
It sounds like you don't have an Agent from whom you should be getting this Counsel; good luck at 4:30 CDT.
_________________________
Dale C. Hittle of GOLDEN RULE PROPERTIES in Glover, Vermont
Where We're Always Striving To Put Together "THE FAIR DEAL"