"The fire went out of control as expected because there was ethanol in the bowl," Stewart told Channel 2. "And instead of putting water on it to put it out, allegedly the teacher grabbed a jar of ethanol and threw it into the bowl."
It is unclear how long the teacher has worked at the school.
McFadden was rushed to Grady Memorial Hospital in Atlanta.
"Third-degree burns to his face, his head, his arms, full body," Stewart said. “Over 10% third-degree burns. It's horrific.”
DeKalb County Schools told the news station the situation is under investigation. The district also said a school nurse went to the hospital with McFadden and school counselors provided support to students who witnessed the incident.