Most of the glass outside has been swept away and Mo Trattles, in her office above Salsa cafe and tapas bar, is sitting at her computer going through the CCTV footage from Sunday afternoon.
Frame by frame, image by image, she tracked the riot that spilled out on to the streets below St James' Park.
"This is why what happened yesterday will turn out to be just a blip," she says. "Things like CCTV and the cameras on everyone's mobile will see to that. Big Brother may be looking at us too much sometimes but at times like this it's great. Within minutes of things kicking off material like this was all over the social media sites like YouTube. And the point is that all of us can see these yobs as clear as day and someone, somewhere, will recognise them."
Over the coming weeks officers from Northumbria police will be poring over thousands of hours of footage similar to that recorded by Trattles. This will be supplemented by endless photographs and videos recorded by myriad eye-witnesses. Police regard such evidence as so central to their investigation that they have already appealed for those with damning footage to come forward.
Chief superintendent Steve Neill, who has organised the policing of Tyne-Wear derby games for 20 years, said: "We'd very much like people to come to us or to Crimestoppers with their footage. It's important we deal with these individuals and put them before the courts."
The small corner of the riot witnessed by Trattles, 51, was a sideshow compared with the main event a few hundred yards up the hill towards St James'. But she was still sufficiently alarmed to pull down the steel shutter over her front door and shepherd customers away from the windows.
Twenty-four hours later she is replaying the lead role played by a thug in a green parka.
He is seen entering the fray at 2.43.02pm, delving into the bar's blue bin in the alleyway outside and taking out four bottles. He throws one within a couple of seconds and then heads off towards the police ranks with the rest. Less than a minute later he is back, this time dragging the bin away so he and other thugs can use it as a portable armoury.
"I've seen the bin on fire on YouTube and I bet you there's footage of the same lad. It's so crazy. Does he really think he'll get away with it?"
Trattles doubts that the riot was organised. "It just looks like idiot kids coming along to have a scrap. There were some genuine Newcastle fans in the bar at the time it kicked off and all they were doing was having a quiet drink. They were appalled at what went on."
There was a similar sense of revulsion at The Strawberry, the pub across the road from the Newcastle United store.
"We'd been open from 9am and the first thing we knew about it was when the news came on at 7pm," said the licensee Caroline Armstrong. "The place was heaving with Newcastle fans and they were all just shocked and stunned.
"There have been bits of trouble before – like when Keegan left the second time, and when the name of the stadium was changed from St James' – but nothing like this.
"When you see the thugs on TV most of them seem to be quite young – school kids out for trouble. The good thing is that these days it's so much easier to name and shame them."
Morten Pedersen, 42, a Newcastle fan on a four-day "pilgrimage" from his home in Stavanger, Norway, was sanguine about the riot.
"It did worry me but I wasn't too surprised because there is a history between the two clubs," he said. "I don't think it means Britain is heading back to the 70s and 80s when football violence was everywhere. It was just a one-off. I will be back. I just hope that next time we don't lose 3-0 at home."
Three police officers were injured during the clashes. So far 29 people have been arrested but Northumbria police expect the numbers to increase rapidly as they identify those involved. One of those already held is the man who punched a horse that had been deployed from West Yorkshire police's mounted section. The horse, Bud, who was struck outside a hotel opposite the ground, is said to have fully recovered. The horse's assailant has been released on bail.