Sudden Short Story 94

"Professor," began the student, after class, as he was putting his materials away. 
"Yes?" he said, hardly looking up at this point. 
"Do you know much about botany?" 
This question was somewhat unusual, as he was a professor of ancient history specializing in migration period Europe.  "I know a little," he said, not letting on just how much he knew.  "Why do you ask?" 
"It's just that I've noticed this odd trend.  Whenever we have class here, the vines on this side of the building are longer after class than they were before." 
He hadn't realized that there were visible effects this far into town.  "Well, maybe those vines just grow quickly," he said, playing dumb. 
"But I have classes in this building Monday and Wednesday, too, but it only seems to happen Tuesday and Thursday.  Since you're here those days, too, I thought that you might know why." 
"Well, that's really outside my field," he said, "It's not like I've measured them or anything, either."  He sought to cast doubt on her observations.  "Maybe you could ask someone in the botany department, though," he continued, maximizing his cover. 
"OK," the student replied, "It was just a thought.  Well, see you next week," she added, departing. 
The professor was relieved, but nevertheless worried:  Was the Wellspring of Life continuing to affect him?  Had they closed the ritual improperly?  He would have to convene with the other Ur-Dren immediately.