Draw a picture of the events in these verses. If possible, draw them in color, to really bring out the contrast of the fire/light and the water with the multitude in the middle. Painting would be fun if you can make time. But if not, at least try colored pencils, markers, or crayons.
Do you think they were really surrounded by fire? Remember that fire was the only source of light they had other than the sun. If Nephi were to describe any other light, it would be in terms of a light source he knew about. So it would have to be in terms of either the sun or fire. How did Joseph Smith describe the light he saw, both during the first vision and when Moroni visited him?
What do you think was the source of the fire-like light that surrounded the multitude?
What does it mean "they were filled with the Holy Ghost and with fire?"