Slot "back" too far forward

[Rich]

I was working a HS playoff game last night and the following happened.

#20 was lined up in a slot position -- he intended to be a back, but he was just way too far forward. Half of him was hidden by the end. He also turned inward -- at about a 45 degree angle.

I flagged this as an illegal formation. #20 was not approximately parallel to the line of scrimmage, so he wasn't legally lined up as a lineman. He wasn't far enough back to be a back.

I had the hardest time explaining this to the other wing so he could take this back to the coach. Did what I explain above make sense to anyone? BTW, I could've considered him a lineman and then flagged him for ineligible downfield, too, but I flagged it at the snap.

My season is over. 41-15 last night. A team tried a double reverse from its own end zone and fumbled the second exchange. A B player fell on it for a TD. Horrid play calling there.

Rich