Despite having been born on a planet other than Earth, Clark hadn't really been on another planet until now. He hadn't ever been in space like this either. He kept his hearing open on each of his ship mates, just in case someone went wrong. Which it did. He actually heard the bear, turned and saw it through the trees, in the moment before Lily did. He had a split second to decide whether or not to reveal his abilities and save her from it, and of course the decision was easy. After all, he'd learned that most of the specimens in whatever this was knew something about the others or had abilities like his.
He was in front of Lily in a split second, raising an arm to keep the bear at bay.