On Sunday morning, Centaur Farm's Exogenous, the Unbridled filly who suffered a severe concussion in a freak mishap prior to the running of the Breeders' Cup Distaff (gr. I), was alert, standing in her stall, and eating hay, leaving the father and son training team of Scotty and Randy Schulhofer optimistic about her chances to recover. However, Randy Schulhofer cautioned that "the next 24 to 48 hours are the most crucial."Exogenous was injured when she reared and flipped over backwards, just after leaving the tunnel and entering the main track for the post parade. She struck her head solidly on the ground, then became entangled with the metal gate near the outside rail. On-track patrons and television viewers watched in horror as veterinarians and others tried to extricate the filly and help her stand. She was sedated and moved onto the horse ambulance after crews put up a tarp-like screen to shield her from the crowd and cameras. The screen is most often employed when a horse suffers a catastrophic injury and is euthanized."When they brought out that damned screen I wanted to throw up," said Hall of Fame veteran Scotty Schulhofer. Randy Schulhofer said a track veterinarian recommended Exogenous be euthanized but the Schulhofers' private vet, Dr. Steve Carr, wanted to bring her back to the barn and try to save her."This was a nightmare," the younger Schulhofer said on Sunday. "She suffered a bad concussion, but her bodily functions are good and we are pretty optimistic.""The big question is how much swelling there is on the brain," said Scotty Shulhofer. "She's a pretty tough filly."Even if she has a complete recovery, Exogenous won't race again. "She'll make a great broodmare," Randy Schulhofer said.