A 32-year-old woman is undergoing elective abdominal hysterectomy under general anesthesia. After induction with thiopental and intubation, the surgeon begins the procedure. During the first 15 minutes of surgery, the anesthesiologist observes that the patient's pupils are moderately dilated, there is some lacrimation, and the patient shows purposeful limb movements in response to surgical stimulation. Heart rate is 95 bpm and blood pressure is 128/82 mmHg. What stage of anesthesia is the patient currently in according to Guedel's classification?