The aerial collision with Gary Cahill is something Ryan Mason can recall all too vividly. 'It was like a bomb going off in my head,' he says.
But it was only five weeks ago, some three months after his accident at Stamford Bridge in January, that the full horror of what he endured was explained to him by the Hull City doctor.
'He said there was a moment shortly after I arrived at the hospital, I think maybe just after I'd had a CT scan, that I was what they call 'unresponsive',' says Mason.
'They acted very quickly and within minutes I was in surgery.