FIS will prohibit drones "as long as I am responsible .... because they are a bad thing for safety," men's race director Markus Waldner told The Associated Press on Wednesday, a day after the night's race in Madonna di Campiglio.
"It was huge luck that Marcel was not hurt," Waldner said. "I am very angry."
The drone carrying a TV camera came down and shattered on the icy slope just behind Hirscher, a few seconds after the Olympic silver medallist started his second run.
In this image taken from video, a camera drone crashes into the snow narrowly missing Austria's Marcel Hirscher during an alpine ski, men's World Cup slalom, in Madonna Di Campiglio, Italy, Dec. 22, 2015. (Infront Sport via CP)
"I didn't know what it was, but I felt something," said Hirscher, who was unhurt and continued his run, finishing second behind Norwegian winner Henrik Kristoffersen. "I thought it was a course worker behind me, or a gate."
Course workers slip through the gates shortly after each skier to smoothen the snow surface for the next competitor.
"I am very relieved that nothing happened," Hirscher said. "You don't want to think about what could have happened when 10 kilograms (22 pounds) are coming down 20 metres (65 feet). That would have been a very serious, bad injury. There are a lot of cool things nowadays. But you have to guarantee the safety — and that was just insane."
"I am very relieved that nothing happened."
According to Waldner, FIS had agreed on the use of the drone at Tuesday's slalom but the pilot wasn't allowed to fly the camera directly over the race course.
"He did not follow our instructions," the race director said. "He had to fly outside of the race track and follow the racer from a 15-meter (50-foot) distance. Then there would have been a margin and nothing could have happened."
Drones have been used many times before at ski races. The ski federation said the new technology was aimed at enhancing the experience for TV viewers as it provides moving pictures from an overhead angle which regular cameras can't shoot.
FIS said legal restrictions in Italy for the use of drones at events are not as tight as in many other countries, such as Austria and Switzerland, where flying over a crowd has been banned.
"This incident is being taken very seriously and the circumstances leading to it are currently being examined."
The company responsible for the camera drone, sports marketing agency Infront, said it was still examining the crash.
"We are extremely relieved that apparently none was hurt," Infront said in a statement. "At the same time, this incident is being taken very seriously and the circumstances leading to it are currently being examined. An update will be provided as soon as secured information is available."
The Switzerland-based agency has been the long-term TV rights holder of the FIS Alpine skiing World Cup.