Nobody gets all the calls right all the time - here's some interesting videos that show how hard it can be to call and how difficult the geometry of play can be....
In this example the ball actually hits Cameron Pilley on the way through and it's still only a let...
here we have Shorbagy asking for the let with room to play - no let...
Similar to the one above Here Adrian Grant gets the let, seemingly with room to play - let given on safety grounds (AG didn't know where JW was...)
from the same match - here JW drops and AG collides with JW on the way through - minimal interference - no let...
Here, in another Matthew Willstrop epic NM tries it on with a turning call - no let, the ball was dead at the back...
Wilstrop vs Shorbagy here - tight decision JW creats his own interference - no let in my view...