A high school psychology teacher has been fired after he asked his students to write their own obituaries as the school was getting ready to have an active-shooter drill on the same day.

But Jeffrey Keene, 63, who was a teacher at Dr. Phillips High School in Orlando, is standing by his decision on the assignment, telling NBC News “In my mind, I’ve done nothing wrong.”

“It wasn’t to scare them or make them feel like they were going to die, but just to help them understand what’s important in their lives and how they want to move forward with their lives and how they want to pursue things in their journey,” Keene tells NBC News.

Despite his intent, the assignment was received well by some students or school administrators. A student who was in Keene’s first-period class became upset about the assignment and went to a counselor, WSVN Channel 7 reports. During second period, a supervisor came to the class to observe, WSVN reports.

Keene was fired before the end of the school day by Orange County Public Schools, NBC News reports.

He tells the Washington Post that his intent with the lesson, which also asked students about “positive actions” they could take to prevent mass shootings, was to get students to share their perceptions on the epidemic of gun violence in U.S. schools.

“I said, ‘How can we fix this situation? How is it affecting you or isn’t affecting you?’” Keene tells the Post. “And that’s how I approached it. And I’m thinking to myself, ‘How in the world could that upset 16-, 17-, 18-year-old students?’”

Keene, who had just started teaching at the high school in January, tells NBC News he plans to look for another teaching job and has no intent on changing his methods.