“I personally apologize,” he wrote, “and am reaching out to the students involved.”

Mr. Telusma said he had received a voice mail message from Mr. Fuchs, who told him that 21 students were affected and invited Mr. Telusma to get in touch.

So far, Mr. Telusma has not called back. He said he needed time to process what had happened.

The university’s director of communications, Margot Winick, said in an email that “trainings relating to the graduations are now under review.”

The discipline to the faculty member, she added, was “pending a review of the appropriate administrative steps.”

That did not sit well with Chris Garcia-Wilde, 22, a graduate who walked onstage shortly before Mr. Telusma, a friend.

“We want him fired,” Mr. Garcia-Wilde said on Twitter.

Mr. Garcia-Wilde said by phone on Tuesday that he and his friends had watched as other students of color ahead of them were hustled along in a “much more physical” way than white students.

They had only wanted to celebrate their accomplishments, he said — not only were they receiving their bachelor’s degrees, but Mr. Garcia-Wilde had also been accepted to medical school, and Mr. Telusma was waiting to hear back from law schools.