Well, I think you'd have to go with an extreme angle on your off-side line to show that, personally. I think this might be leaning too far to the left and he's still clearly behind the line, from the last man's toe:
I think I'm right in thinking that, the angle has to be somewhere between: The one for the line for the 18 yard box on the left and the cut of the grass on the far right, at 12 yards(penalty spot). So, it will lean more left, the further right you place it. It's clearly closer to the 18 yard box, than it is 12yards, so the angle has to be closer to the one at 18 yards.
It is closer than I thought at first but perhaps UEFA didn't think it was. It would have been nice to see it(so we don't have Liverpool fans claiming we got away with one) but it's still easily on-side for me that.