"Split up, I think," Remus replied to Lily thoughtfully, looking around. He didn't care how, though he thought that either Kara or Raven should probably come with him. He was a little worried for Kara, since though she could probably get herself out of most danger, she was still young and likely to overestimate her own powers.
"Right." He looked at the group again, which was just growing larger. "We'll all have to be careful with these plants. Don't touch anything that you don't immediately recognize," that was directed mainly at Raven and Kara. "And try not to kill things if you can help it." He looked at Lily. "A freezing charm should do the trick if you want to cut things down and keep them."
He wasn't exactly trying to take charge, but he seemed to be the only one who knew Raven, Kara was likely to listen to him, Harry was newly come, and Lily was his good friend. It followed that he was sort of a connection between them all. However loosely. "All right. I'm going to go confront the tree. Who's in?" Hopefully a small group, one or two others.