He senses that something bad will happen, but stays anyway because his logic contradicts his initial uneasy feelings.
In the Victorian Era, logic was perceived as good, while intuition was evil and immoral. Seward writes how he was at first convinced that Lucy was, in fact, a vampire, but later thinks these ideas are outlandish.
He is unwilling to accept Van Helsing’s intuition because his thoughts could not be justified by logic, but could be proven merely by beliefs.
These examples of intuition opposing logic demonstrate a form of good versus evil in Dracula.
Good and evil was expressed in the various aspects of the natural world, such as light and dark and life and death. Seward writes that Renfield “fears the thought of being...