The runes shown in the picture weren't very clear. In fact, the runes weren't complete at all, as the central mess of them was obscured behind either incompetent drawing or random ink.
How did someone recreate runes without knowing what they were first?
One viable approach was to look at a collection of runes and use the limited portions shown on the scroll to find out which runes were possibly used, then refer to the whole magic array to confirm the final choices.
That sounded like a LOT of effort.
Angor quickly regretted accepting the request because it looked more and more like a bad deal now. He could have tried to find the magic threads himself while spending way less time.
The woman told him not to check the scroll during the meeting, probably because she knew the difficulty of the quest.
A*shole… and she said there was some kind of big secret in the scroll. So this was her plan.