Littlefoot would likely want to investigate & explore the area & try to find out what it is. Cera, I think, would be of the mind, "who cares, let's get going." sort of mind and want them to continue where they were going. Petrie would be to scared to get close. Spike would want to eat anything that smelled eatable in the camp. Ducky may be willing, depending on what they were doing and heading, to either side with Littlefoot or Cera, depending.