I can agree, but at the same time, where do you draw the line then? It's complicated, agree, but let's say we allow some elasticity of 2 cm then if someone is on 3 cm he is offside. Let's say we allow 5 cm, if someone is 6 cm is he offside then? 7 cm?
The line has to be drawn somewhere. To me it's difficult to say where the line should be drawn but the simplest way is the one we currently have. The problem is, as others say, that it's difficult to ensure that where you draw the line is the correct line. Solution would be, as you say, some elasticity to allow a margin of error, but then you have a new line to dispute. So it's no real solution other than pushing the problem to another situation.
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I am always happy when we score but worry when someone like Paredes scores in case that fuels our management's idea of keeping him around.