As soon as the lecture begins, Edward immediately enters the class...And that too keeps looking at Emma but Emma doesn't understand this at all...

Emma could not understand everyone's reaction Because everyone in the class looked at her in a very strange way, probably because she was with James..

During the lecture, the professor did not ask any questions to Emma today maybe it's because James was there..And he wanted to be good in James's eyes so that is one of the reason..

But there was still somewhere in Mr. Johnson's mind to fulfill his purpose where he had to kill as many people as possible and suck their blood...