The Doctor looked around, his eyes growing frantic along with his walking pace. She was gone. His TARDIS, his baby, was lost and he was stranded on a planet he did not recognize. Faint whispers in the darkness set his senses on edge, aggravating the already painful headache he had.

He may not have looked it at the time, but he was injured. His head throbbed and his insides burned making it hard to sense any other life around him. There were some people he did not want to run into in his current state. 

As he continued to walk/stumble around in search for his beloved ship, he was oblivious to any eyes on him, and was immensely vulnerable.

Running an anxious hand through his brown hair and scuffing his white converse against the rough ground, he pulled out his sonic screwdriver to do yet another scan for the TARDIS.