The Doctor listened intently to Leander's account of the man's death, and his face went slightly grim. "That's the Slitheen alright," He stated, looking towards the forest landscape with his brown eyes fixed upon the trees. "They must have crashed here then, which means that they must be up to something, which is never good when Slitheen are the ones who are involved." 

The Time Lord sniffed the air lightly, and then looked back to Leander. "If they're murdering people, then that means that they've probably disguised themselves using human skin. Anyone who lives near-by could be a Slitheen right now. Well, when I say that I mean anyone who is relatively 'big' in size." He continued to explain. He thought about his options for a few seconds, knowing that he would have to investigate sooner rather that later. He would much rather that the young boy was kept at arms length, not wanting to put him in danger. 

"Leander, I want you to go home and keep yourself safe. I need to go into that forest," The Doctor said as he pointed towards the set of trees just over a few fields. "If the Slitheen are in there, then at least I can hopefully find out what they've stayed on Earth for, and while I'm at it give them a good telling off for slaughtering as well. But they are ruthless, and could kill me if they really wanted to, but that won't happen as long as I have my sonic. Hopefully..." The Time Lord drifted, spinning his sonic in the air and catching it with a professional hand.