Fireman’s Fund Insurance Company brought a subrogation action arising from water damage and alleged gross negligence by Holder Construction Group and McKenney’s. The trial court excluded Fireman’s expert testimony and granted summary judgment to the defendants on causation. The Court of Appeals of Georgia affirmed the exclusion of one challenged part of the expert proof but held that the trial court erred in excluding the relevant expert testimony altogether. Because the record contained an affidavit linking the defendants’ conduct to the loss, the court also reversed summary judgment on causation. The judgment was affirmed in part and reversed in part.