Some other guidelines you may choose to use......
(1) Was the kick caught and fumbled or muffed
? If you would have ruled it complete if a forward pass = catch and fumble. If not = muff. If unsure, hold your whistle, it's much easier to adjust the clock, if it is then determined to be a muff than to become an eager tweeter if not.
(2) If A fumbles near its goal line and B muffs ball into the end zone, if the fumble had a chance of rolling into the EZ without the muff, rule safety if recovered by A in there. If fumble was bouncing away form EZ, B's muff would now add a new force.
(3) If teammate(s) are aiding the runner, rule his forward progress has stopped.
To flag
or not to
. I'll respond to calls from coaches on the rules, no on judgement; however, I still get several on foul calls every year. 90% of those are on flags the coach doesn't think should have been thrown and 10 % are on flags they think should have been thrown. It's much easier to explain that the official was probably screened or didn't see the full play, then to explain why he saw something that didn't appear to happen.