Yes, during class it is particularly difficult to stop the flow of a lecture for the benefit of one student who may not quite comprehend what is being discussed while all of the other students seem to be doing well with the material at hand. One thing, though, before suggesting that the student meet you after class, I would definitely check with the rest of the class to determine if indeed everyone does understand the material. Often, students who lose their way during a lecture will not speak up for whatever reasons, so it can be the case that the one student who does speak up may actually be speaking for several other confused students who simply have not taken the initiative to request clarification. So, when one is lost, never assume that he or she is the only one. If we find that others are struggling as well, then great! Time to rework the lecture, to better ourselves as educators.