I haven't seen the video (youtube banned here!) but in Fulton's case would he have been better off without the lid on? - actually this is a daft question, I wouldn't dream of going into a bowling machine session without a lid on, but hardly ever wear one in a game. I think this is different to Pollard's injury, as with a bowler the bastman has more signals that you are going to get a short one that you instinctively pick up, whereas with a bowling machine the length can sometimes be variable, especially at higher speeds, plus the ball frequently "pops" out of the front and there is a tendency to react a fraction slower to a bowling machine.
Being careful how I phrase this, but is the issue also to do with the gap between the grille and the visor rather than, necessarily, the type of lid they were both wearing?