Here's my input on this.
Broads helmet in the tweet shown seems to have both a very wide opening(compared to barkers in the video) and also seems to not be square, the gap between peak and grill on the right(broads left) looks wider than the right.
Now this could be for two reasons, and really only broad and or ayrtek can answer them. Is it a defective shell/grill? Or has Stuart altered the settings to give him a better view, not thinking the effect would be detrimental?
Also The two incidents show barker, and broad, there is a 2 mph difference in bowling speed. Which I personally don't think is the difference between fail and pass.
It is eithe down to faulty/badly adjusted helmet, or the increased speed of the top edge of broads.
As much as i rate the ayrtek, looking at woakes bat currently, the double grilled masuri, has such a small gap, and the added crumple zone, I can't help thinking the masuri may have faired better.