School officials and witnesses praised guidance counselor Jesse Wasmer for wrestling the gun out of Gladden's hands.
"This situation could have been much, much worse," county schools Superintendent Dallas Dance said. "Thanks to Jesse for his quick thinking."
The victim, Borowy, has Down syndrome, according to classmates. His family issued a statement thanking supporters for their prayers and asking for privacy.
Gladden was being held without bail. A bail review was expected Wednesday, and assistant state's attorney Garret Glennon said he would argue that the teen continue to be held without bail. A preliminary hearing was scheduled for Sept. 7.
Psoras cautioned against a rush to judgment.
"There are no pat generalizations that can ever explain these types of cases. The human brain is exceptionally complex," he said. "When all the facts come out, you'll see that Mr. Gladden was not some demon."
Gladden's father, Robert W. Gladden, told the AP Monday night that his son had been bullied, although he did not elaborate.
Classes resumed Tuesday at the school amid a low-key police presence. About 150 students turned out for a prayer vigil organized by local churches on the school grounds. Some students wore T-shirts and bracelets reading "Pray for Daniel" and "Team Wasmer" in reference to the victim and the guidance counselor.
Nuckols reported from Washington.