Vaughn, whom they respected through gritted teeth; Weasley, and Professor Rosier, whom they admired with forced smiles, had despicably—no, innovatively—set up a "two-way pursuit" mechanic for the mission.
In other words, the moment they accepted the mission, the Runespoors already knew that someone was coming to steal their eggs.
The most despicable—innovative—part was that they could accept a mission to steal Runespoor eggs, while the Runespoors could also issue missions to recruit helpers to stop them—
Heaven knew that when Harry learned of this arrangement, he nearly shattered his clenched teeth.
When the practical lesson ended, he "tactfully" told Professor Rosier that the mission setup was unreasonable. Yet the professor replied with righteous conviction, "This was a compromise made because practical lesson time is limited, dear Harry Potter. First, I must emphasize once again that this is practice, not a real wilderness. Otherwise, I'd wager that with only three hours, none of you young wizards would be able to find where the Runespoors were. So we had to mark the location of your mission item on the task scrolls you received."
"But that would obviously be unfair to the Runespoors. For the practical lessons to continue in the long term, I had no choice but to make corresponding adjustments. Mutual transparency between the mission executors and the mission targets was the result of careful consideration."
That counted as careful consideration?
Harry could not understand Professor Rosier's train of thought. Of course, it was not all bad news. At least this bizarre arrangement had not been Vaughn's doing.
Though according to Ron, "Good thing it wasn't Vaughn, or he definitely would've screwed you over!"
As for the second worry, it was also related to Vaughn—yes, Ron and Hermione again. After Ron had "slandered" Vaughn following practical class, Hermione had fallen out