This is in regards to the solution in Slitherlink - It's all in the 2s
I know it may seem dumb, but I don't understand the logic behind the second 2 chain in the solution. To help provide clarity in my question, imagine that each dot corresponds to a Letter-Number coordinates like
7 6 5 4 3 2 1 ABCDEFG
The line the is next to the top 2 in the diagonal pair where the line goes from G-4 to G-5.
I'm also lost on why there is a line from G-2 to G-3?
Thanks in advance for teaching me.