But the devastated reaction of his fellow classmates, who sprint over to see what's happened before pacing up and down with their heads in their hands, appears to suggest he had tried to commit suicide.
Details on the incident are currently scant. It's not clear exactly where in China, or at what school, it took place.
The clip was uploaded to LiveLeak Wednesday, however, and has since gone viral with more than 85,000 views.
"High school student Xiao Zhen leaps to his death from a window in the middle of class," the description says.
"It is believed this happened due to pressure of preparing for college entrance exams," it adds.
The video's authenticity has not been confirmed. But many commenters have said it fits with the trend of depressed Chinese youngsters taking their own lives due to the stress of school.
Video Link: http://www.nydailynews.com/news/world/stressed-chinese-student-leaps-death-class-article-1.1727709