A 32-year-old multipara (G3P2) at 40+2 weeks is in the second stage of labor for 45 minutes. The fetal head is at +3 station in the left occiput anterior (LOA) position. Scalp is visible at the introitus without traction. Fetal heart rate is 135 bpm with moderate variability. The obstetrician applies a vacuum cup to the fetal head and performs traction. After 3 contractions, there is descent to +4 station. On the next contraction, the cup detaches from the fetal scalp. What is the most appropriate management?