No worries, mate. Put it in your kit bag and move on
1B, 2B, and 3B are in fair territory, so any ball that 'bounds' into them is fair upon contact, as if it had touched a fielder over fair ground.
...but, just curious, why are you going to tell the coaches? If they care, they'll let YOU know the next time you see them
After all, do
they tell
you later on about their coaching mistakes in previous games?