The Doctor's mood had improved immensely since Rose's return. Which meant he was much less closed off to everything and everyone around him. He had realised that something had been itching at the back of his mind for a while now but he had ignored it and pushed it aside. At first dismissing it as something paradox related and then later as a side-effect of his mate-bond with Rose being cut off. But now...
He had gone out to get some things for Rose and the Twins when the shockwave had rippled through the island and in turn his time-sense and mind. It tingled right through his nerves and caused the hairs to rise on the back of his neck and hands. Timelord instincts pushed the sudden headache and nausea aside for the moment and at the same time led him to the 'impact' site. It was partially curiosity but also suspicion and wariness. It could be anything. Something that could harm or be dangerous. But there was also something familiar...