For the benefit of those newer officials that find the rules language a bit circular could you enlighten us with a simple plain english answer?
The reason I referenced 7-2-5 itself, rather than try and explain it for readers is that the "Exception" covers several variations that are very specifically situation related. I would suggest reading each variation separately and fully understanding each before progressing to the next variation, which essentially becomes an exception to the previous exception.
There are a number of rules that address multiple, similar but different directions for similar, but different situations, that when read quickly without fully comprehending can cause confusion and future problems.
Most often, the best way to try and eat and elephant is simply one bite (thoroughly digested) at a time. That's a practical formula to follow for understanding football rules. Often Case Book examples can help the digestive effort.