He said it was another example of the harm alcohol causes and the poor decision making of those under the influence.
"St John has a zero-tolerance policy for abuse of its people and equipment and any footage that we obtain of people abusing our people or equipment will be passed onto the appropriate tertiary institution or New Zealand Police immediately," Mr Third said.
Otago Coastal Area Prevention Manager Inspector Wil Black said the reckless and irresponsible behaviour shown was completely unacceptable.
"No-one should have to put up with this during their workday, especially while assisting those in need.
"Those responsible should know that they are not only putting themselves in danger, but innocent people too."
Anyone who witnessed the incidents was urged to contact Police on 105, he said.
St John and New Zealand Police ask students to enjoy activities during O Week, but to do so safely and responsibly while being considerate of others.
A University of Otago spokeswoman said the university was working with emergency services to identify if any offenders were students.
If they were Otago students, the consequences would be serious, she said.
Many non-Otago students and other members of the public were also attracted to events in the student area, she said.