Yesterday the tournament was using temporary fencing. The wind was relatively strong and was blowing in from left field. This caused the fence to lean inward at about a 60-70° (where 90° is upright). A hit to left field rolls to the fence in the area where the fence is leaning in.
This got me thinking...
Surely, we can't expect the defenders to root under a collapsed fence for the ball, but where is the threshold for how far the fence is leaning in?