EE WAS WAITING FOR ANOTHER EE TO EXIT A LADDER ON #1 KILN HEAT EXCHANGER. AS OTHER EE WAS EXITING THE LADDER, INJURED EE WALKED OVER TO THE LADDER LOOKED UP AND A 12"" CRESENT WRENCH FELL OUT OF OTHER EE'S BACK POCKET AND DROPPED, STRICKING INJURED EE IN THE BRIDGE OF HIS NOSE BREAKING IT AND REQUIRING STICHES.