This can/will happen at every level.
This same thing happened to me at a 10 yo Pop Warner Game this season. I was the most experienced official of the three and I worked the home team sideline.
There was a late hit OOB against B but A hadn't made the line to gain. It was early in the 2nd Quarter. It was my flag. I brought the other two guys together and I explained that since A hadn't made the LTG, B would get the ball -15, I was not 100% sure in my mind and I questioned the other two guys, they agreed.
I announced the penalty and my coach went nuts, argued with me for a prolonged period and got his staff in on it, too. He started taunting me as I worked the sideline, threatening to protest the game. He was in my head.
I perservered, finished the game, the home team lost handily. I worked the next game and on my way home made a bunch of calls.
We got it right, but boy was that a rough experience, I hope our brothers out west aren't too hard on themselves and know that we all have a sick feeling in our stomachs for them, too.