>>In August 2015, he suffered a concussion when he went helmet-to-helmet with another player and was knocked unconscious. "I think it hurt my ability to think

>>In August 2015, he suffered a concussion when he went helmet-to-helmet with another player and was knocked unconscious. "I think it hurt my ability to think well mathematically," Urschel said. "It took me about three weeks before I was football-ready. It took me a little bit longer before my high-level visualizations ability came back." Losing a high-level cognitive ability must be terrifying; the flood of relief upon regaining his ability (probably slowly?) after 4+ weeks must have made him deeply question his continuing commitment, and then the CTE study pushed him over the edge.