Robert Schlagenhauf worked as a bus driver for the Greyhound Corporation. One night, the bus he was driving rear-ended a tractor-trailer. Seven passengers on the bus were injured and sued Schlagenhauf and Greyhound Corporation for damages. The complaint alleged that Greyhound was negligent for allowing Schlagenhauf to drive a bus when it knew that his eyes and vision "were impaired and deficient." The plaintiffs petitioned the court to order Schlagenhauf to be medically examined concerning these allegations. Schlagenhauf objected to the examination. Who wins