Harry crouched, disillusioned and under his invisibility cloak, in the corner of Jethro’s basement. When Tony explained the situation Harry had made a quick stop at Gringotts to get the cloak. He knew that Tony was at the entry of Gibbs’ house while Ziva was trailing Gibbs back from whatever ruse he was pulling. Tony had first protested at Harry being the one to wait in the basement while he was out front. However, Harry reminded Tony that he was only there to protect Gibbs. Any shooting that was going to happen would be left to the other three. Harry was there for defense and to provide memory proof. He was in the basement as Gibbs assured everyone that that was the most likely place anything would occur.