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People in the experiment were deemed unconcious from 1.6 seconds to almost 10 seconds after the choke began. Others were not choked out after 20 seconds. If you held the person who was unconcious after 1.6 seconds for another 8 or 9 seconds, you could cause permanent brain damage or death.
Chokes is due to movement of many nitrogen bubbles from the venous system to the lungs. Although a small number of bubbles will be trapped and exhaled, a large number can overwhelm the lung circulation, and lead to respiratory distress. Symptoms can occur up to 12 hours after the dive and may persist for 12-48 hours.