Sam and Dean both watched with amusement as Lestrade rolled his eyes at the mention of 'the freak' and let out a quiet sigh before turning back to them;

"Sorry guys, just give me a second. We need to let Sherlock look at the scene first." As soon as Lestrade started to walk across to the other side of the crime scene Dean immediately turned to Sam;

"What kind of name is Sherlock? He sounds old and weird." Dean twisted his face and over dramatically shuddered, a grin starting to form on his lips,

"Dean we are meant to be American Secret Service, at least act like it." He, what could only be described as, pouted as he looked at Sam.

"Fine. Mr… no fun…" Sam internally shook his head; one day Dean would have a good comeback, one day.
After their small exchange they looked over to who the Detective Inspector meant by 'Sherlock', walking toward the older man there was what must have been Sherlock and another person walking with him.
As Sherlock walked toward the crime scene he straightened his long coat and popped up the collar whilst lifting his chin, the first thing that came to mind was a peacock, he certainly did seem to have a certain…. Flare.

"He looks like even more of a drama queen than you Sammy." He glared at Dean for a moment before letting his gaze get drawn back to what was going on with Sherlock. The man with him was notably short but he held himself like he was in charge, small but hard to miss.
As soon as Dean turned to observe again they saw the taller man start to move around the crime scene, it seemed like he was observing but doing so rather quickly. He flitted around the bodies, ducking low to take a closer look and standing up again before hopping over to a different area, the whole thing was certainly 'eccentric'.

The other two were just watching him as if they had seen this done a thousand times and it was perfectly normal, well from the brothers point of view it was a bit strange… and they had been trapped in TV land by an angel.

What may have been a couple of minutes of watching had soon passed and they saw Sherlock walk over to Lestrade and they assumed he told him he had everything he needed.
Before he turned to leave though he saw Sam and Dean and practically stared at them until he could burn a hole through them; they saw Sherlock have a quick exchange with the DI before he turned in a dramatic swing of his coat and left, the shorter man following.

"What on earth was he doing?"

"Hell if I know and what was with the coat?!" Sam shrugged as Dean saw Lestrade walk over and he must have noticed the looks on their faces,

"Don't even ask, come on you can take a look now." He lifted the tape for them and waited until they had stepped under before walking them to the, unfortunately plural, bodies.
As they made their way over Sam started looking at the scene while Dean stood by Lestrade,

"So who is it you are after?"

"He goes by the name Crowley." Lestrade looked nonplussed by the name, obviously not being familiar with it.

"Can't say I have heard the name but we will certainly let you know if we come across it." Dean looked over to see how Sam was doing but he was still looking, he let him get on with it and turned back to the DI.

"So who do you think is connected to the murders?"

"Moriarty, not just murders either. We believe he essentially has his own criminal empire."

"Can't say I have heard of him either, though he does sound like a man Crowley would be involved with." It may be the someone that Cas was talking about who was working with Crowley. Sam was soon finished with the scene and walked over to them.

"I think that will be all, we will be in touch." Lestrade merely raised an eyebrow and shook his head as they both turned and walked away from the crime scene.

"Bloody Americans."