There's no spin required, it is a simple easy decision, you just have to know what you are looking at.
This is the sort of rule people always call for in other areas, nice and uncomplicated.
Here's the formula:
Did the player kick or handball or force the ball over the line? Yes/No
Did they punch the ball over the line in a marking contest? Yes/No
Is there a team mate close by where the ball went out? Yes/No
Were they trying to score? Yes/No.
If you get yes, no, no, no, then it is a free kick. Any other combo and it's not. No mind reading, no judging skills or pressure, game situation or anything else.
You can argue the rule is wrong and should take those things into account and that's a different argument, but the way the rule stands that is exactly how it is applied and there is no possibility of arguing that decision is incorrect.
Run that criteria over every out of bounds decision you see and you'll soon see that it's correct.