Art Donovan saw a lot of stuff during his 12 years in pro football .
As the grizzled Hall of Famer settled in to watch the Ravens ' game Monday night , something flashed on the TV screen that gave Art Donovan pause .
Art Donovan saw a lot of stuff during his 12 years in pro football , but as the grizzled Hall of Famer settled in to watch the Ravens ' game Monday night , something flashed on the TV screen that gave him pause .