The 45 line should be exactly bisected by the 1/2 roll. The judge should look for the beginning of the upright 45 line (at the end of the starting radius for the maneuver), then note the distance from there to where the roll occurs. To be really exact, it's the distance to the middle of the roll (at 90 deg), but you can never see things that accurately on a figure that isn't flown in front of you. From that point, the distance along the 45 line while inverted until the start of the radius for the 5/8 loop should be equal. Then, the radius of the 5/8 loop should equal the radius of the starting radius. Forget about exactly how the Aresti was drawn, i.e., don't try to determine where to place the roll by whether the author did a nice neat job of placing the roll element exactly in the middle of the line. A single roll element is always centered on the line segment it is drawn on. Don't confuse this with the way to fly/judge a "Split Ess" for example (half roll, half loop), where there is NOT supposed to be any line after the roll. That's no line segment as an integral part of the figure in that case, only a line preceding the figure.

If someone ever scores a zero for this figure simply for not pulling soon enough after the roll, they should probably have first aid administered right away. Too many hours baking in the sun if that happens, eh?