I keep sports talk radio on in the office as background and they've been talking about this all morning... but I hadn't posted anything about it until I just heard DP talking to an officer that was on the scene who provided information I hadn't read online yet. Although the officer I mentioned was not the first responder, he said that Winslow's main complaint was of chest pains.
Over the handlebars after hitting a curb at 35 mph (estimated), I'd say he cracked a couple ribs.
Good thing he's soldier. /sarcasm