Charles shrugged his shoulders confused after seeing the Doctor's excitement. "So?"
The alien still holding the black shoe was caught off guard thinking his point was rather obvious. "What, Really?"
"Just proves she was here. Where is she then, Doctor?"
The Doctor was relieved and sighed. He thought for a minute there that he might have had the wrong logic. "Blimey, not used to negativity like this. It's great news, Charles, because it got enveloped in just enough zamonian radiation so that if I build the right type of tracker than we can find her signature, and not enough for the shoe to disappear with her. And if I'm right than it should be covered in it!" The Doctor than took the shoe and put it up to his face where he liked it. "Yup, that is definitely zamonian."
Charles was flabbergasted holding a shocked face which gave way to disgust. "Sorry, did you really just lick my wife's shoe?"
The Doctor sighed again. This time he was just annoyed. "Would you rather I not help you?"
"No, that's fine. How… how can I help?"
"Hold a couple objects for me, will ya?" The Doctor reached into his pockets pulling out a cylinder tube before handing it to Charles. "Yamra energy." He next pulled out what looked like a remote controlled car controller complete with antenna. "Radiation detector." Finally, the Doctor pulled out and passed to Charles a ham and cheese sandwich with a wink. "Lunch. Possibly the most important of all."
Charles could not believe this Doctor. "What race of alien are you?"
"You don't like ham and cheese? I thought everyone liked ham and cheese."
"Who are you?"
"I'm here to help. That's all you need to know."
"Why? Why are you being so helpful? What's the real reason that your helping me?"
"Hand me my objects please."
"Doctor?"
It may have been annoyance of Charles, but it also could have been years and years of frustration from the Time War, Rose, and the Master, but the Doctor snapped at him. "Because I know what it feels like to lose someone, ok!"
Charles passed him the objects in silent understanding not wanting to press him. The Doctor handed him back the ham and cheese with a grin. "The sandwich is for you. You're going to need some nutrition because we might have to run." He winked suggestively at Charles again which Charles didn't understand fully.
As the Doctor began to pull out his sonic screwdriver and use it to open the controller, Charles stared at the sandwich in his hands. For being in a pocket the food didn't have a hint of lint or even an indication of being smashed. It actually looked brand new surprisingly. The thought disgusted him that he might eat something that was in someone's pocked, but while seeing the Doctor looking brilliant by combining the chemical and the controller with his blue flashlight looking thing he decided that maybe the Doctor was right. He was hungry after all. Charles took a bite of the sandwich and his eyes bulged as he graced a coy smile. "That's… that's actually pretty good! Thanks!"
The Doctor looked up at him grinning like a cheshire cat. "Brilliant! But, you can thank Rose." The alien returned to splicing together whatever he was working on.
In between bites Charles asked, "That's the person you have that's not here, right?"
The Doctor responded absentmindedly, "She's shopping. Needed some alone time."
Charles nodded as he took the last bite of the sandwich. "Right."
The Doctor held in his hands the modified controller that beeped as he also still held the sonic grinning at his quick handiwork. "Oh, I am one seriously brilliant man!"
"What do you got there?"
The Doctor might have not even heard him as he mentioned to himself, "All I need is a sample." The Doctor turned his attention back to Charles. "You've kissed her, yeah?"
Charles was confused. "My wife? Of course, but what does…"
He was cut off as the Doctor leaned in close to his face taking his screwdriver and scanning his lips.
As the Doctor pulled away the shocked if not slightly homophobic Charles stared in revolted shock. "Why? Why?"
The alien patted his machine with pride. "Needed a second source of a life signature for the Yamra Energy Detector." The Doctor got up to scan the shoe as he continued. "Yamra energy was used in the early days of teleportation. This machine can track anyone that's been exposed to it in about a fifty mile radius. And it's beeping!"
Charles asked hopefully, "Rachel?"
The Doctor cocked his head to the side as he excitedly yelled, "Allons-y, Charlie!"
The alien took off running towards the signal as Charles got up and chased him out of the building…