Attack depth

Call me thick but I am struggling with the attack depth explanation how does this vary the play exactly
It 's the "angle" of the attack line.

Left: Low attack depth
Right: High attack depth
http://i.imgur.com/fX7Vmma.png
Great example PierrotLL!!!!
Now just to get the 10 to pass to where 12 is lol .... Or is 10 trying to prove he can ruck lol
Taff - British Lions :

Now just to get the 10 to pass to where 12 is lol .... Or is 10 trying to prove he can ruck lol

What seemed to work for me a bit better is increasing reverse defence.