You’re a Black teenage male just crossing the road. You haven’t done anything wrong but a belligerent cop is suddenly in your face.

And before the day is over, you will be charged with assaulting police, threatening death and assault with intent to resist arrest.

All of those charges will subsequently be withdrawn.

Nearly six years go by.

On the morning of Aug. 10, 2017, you — one of the “Neptune Four” as the quartet of Black youths arrested in the incident that night have become known — finally get to tell your story in front of a police disciplinary tribunal.

Because the officer who allegedly arrested you unlawfully, who allegedly pointed a gun in your stunned face, who allegedly dropped you with a punch in the head, who allegedly smeared blood from a cut finger across the back of your vest — a cut you did not inflict — has himself been charged under the Police Act with unlawful arrest and two counts of disorderly conduct.

That’s Const. Adam Lourenco, who has pleaded not guilty.

Read more:

Teen testifies he stood up for himself, then got punched by a cop

Another officer, who purportedly stood by as all of this was going on, deliberately turning his back on the scene and ignoring pleas for help, is Const. Scharnil Pais. He also has pleaded not guilty on one count of unlawful arrest.

Oddly, on Day 2 of this hearing, the prosecutor, Insp. Dominic Sinopoli, does not ask the witness how Lourenco cut himself on his utility belt.

Perhaps that will come later. Lord knows this entire matter has moved like molasses, with preliminary excursions to Ontario’s Office of the Independent Police Review Director, and pre-hearing arguments (rejected) for the Ontario Human Rights Commission to get a place at the table on the grounds that an exploration of racial profiling was intrinsic to the hearing, and even a motion (brought by Lourenco) that the adjudicator, the judge in other words, be removed over the “optics” of an old misconduct allegation. Insp. Richard Hegedus, the hearing officer, cleared himself of reasonable perception of bias and an application for judicial review was quashed.

Got all that?

So now, on Thursday, we reached the meat of the thing with the first of the four Blacks youths — three, actually, because one of them formally withdrew from the collective complaint — sworn in to testify. Not a youth anymore, aged 21, but his identity remains protected because he’d been charged under the Youth Criminal Justice Act — even though those charges no longer exist.

The young man unspooled his tale and then did so again as commentary for the Toronto Community Housing surveillance video which captured most of the encounter.

Four teens on their way from a Neptune Dr. public housing project, in the Lawrence Heights area, to a Pathways to Education meeting across the street.

There they are on the video, exiting the building. And before you can say who’s-your-daddy an unmarked black police car pulls into the parking lot.

“Very aggressive, as far as their body language,” the witness says, recalling how Lourenco and Pais — both members of the now-disbanded Toronto Anti-Violence Intervention Strategy (TAVIS) unit approached the group. Lourenco got in front of them, Pais behind.

It was Lourenco who told them there had been a robbery in the area and they matched the suspects’ description.

He demanded to see ID. “I’m 15 years old. I don’t have ID on me. I said, you can call my mom. She lives in that building.”

But this youth, he’d earlier attended an Ontario Justice Education program and knew that he wasn’t compelled to identify himself.

“I asked him, ‘am I under arrest?’ He said no. ‘Am I free to go?’ He didn’t answer.”

Instead, the complainant testified, Lourenco began berating him. “He was calling me names, that I was being a smart-ass. He was trying to provoke me.”

Lourenco, the witness said, steered him away from the three other youths — which seems evident on the grainy video. Hits him with a couple of uppercuts in the midsection, then a hard “shot to the head and I fall down.”

The other youths implore Pais to intervene but he tells them to sit down on the ground, then turns the other way, steadfastly not looking at his partner.

“When I was on the ground . . . he’s still calling me names, bitch, wannabe thug, smart-ass . . . ”

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Lourenco, while cuffing the youth, uses one hand to pull out his gun — points it at the three other teenagers, points it at him.

To the others, threatens: “Don’t move or I’ll f----- kill you.”

To the handcuffed teenager: “He says, ‘I’ll kill you as well.’”

Asks if the cuffs are too tight. The teenager says yes. “So he tightens them more.”

It was at this point, the witness testified, that Lourenco cut himself on his utility belt. “Look, you’ve just assaulted a police officer.”

As he’s lying on his stomach, the witness continued, Lourenco wipes his bleeding thumb along the teen’s back. “He was kneeing me and scraping my face on the sidewalk.”

He was shoved violently into the back of a squad car that had just arrived on the scene. “Throws me in, slams the door on my legs.”

Sinopoli: “Did you ever assault Police Constable Lourenco?

Witness: “No.”

Sinopoli: “Did anyone in your group?”

Witness: “No.”

Sinopoli: “Did you spit?’’

Witness: “No.”

He was taken to the station, booked, dumped in a cell — no food, no phone call. He was 15 years old.

He spent nine months on bail.

None of the allegations against the officers have been proved at the tribunal.

Lourenco and Pais were charged under the Police Act in September, 2014.

In unrelated matters, Lourenco has also twice been criminally charged with drunk driving: One stay of charges, one guilty plea.

The hearing continues.