Young Boy with Back Pain after Diving Accident

The pain was immediate at T5-6 after he struck his head on the pool bottom. Can you Dx his injury based on the video interview?

An 11-year-old boy went down a pool slide, head first, and struck the back of his head on the pool bottom. He reports he had immediate pain in his back at approx T5-6, but could move all his limbs. C-collar was placed at scene; pain meds given at ED. GSC, 15; vital signs, WNL. Watch this video interview with the patient.

What's your diagnosis?