"He flies through the air with the greatest of ease! That daring young man on the flying trapeze~!"
@illiteratedickgrayson might be moving as slowly as molasses to Kryptonian senses as he swings from a highrise apartment building and into a series of flips. He lets himself freefall for a few stories before sitting out his grapple again to angle himself around another highrise, his blue, gold, and black suit disappearing into the Gotham night.
As showy as he is, Nightwing knows how to hide himself in the shadows with an ease that borders on the uncanny. His unknowing targets in an unmarked van, tan, plates xxx-xxxx, dent on the left rear bumper, have been good at tracking vigilantes through social media sightings. He can see them now, coming out of hiding and heading toward the docks, the opposite direction of where he's just been seen going.
The vigilante follows them stealthily and silently, all the way to the warehouse of a company he makes note of. It's likely yet another LexCorp subsidiary; who else would be making underground deals in Gotham for even a small amount of Kryptonite? He settles into the rafters to gather information and decide whether to interrupt the deal or trace it.
Supergirl is walking on the streets of Gotham in civilian clothes. Her straightened hair is ginger and she is wearing a green shirt and plain denim jeans with an envelope in the lining, along with some block heels, which might even make her seem inconspicuous around these parts...
She checks the address, which she has written down in a torn-off piece of notepad paper. "Is it the warehouse on the left or the one on the right? They said it was number 801 on the..." She looks around while still only facing forwards, enabling her X-ray vision to look through the concrete wall of the warehouse. She spots the number 801 from the indent on the poorly-lit metal sign from through the wall and turns right, smiling, happy that she could actually find someone that would sell her this. And what luck that she didn't need to get lost on the way there!
Her heart starts pounding as she walks around to the pull-up metal door and rings on the buzzer. A human would be sweating by this point, so in the blink of an eye, she zooms away and back, getting some spray from the ocean (luckily we're near the docks) on her face and clothes, knowing that the salty water could be mistaken for sweat due to the salinity. She probably set off a few speed cameras and accidentally gave some poor drivers speeding tickets, but, having done far too much research into the speed cameras available in the area, at the speed she went she would have been flagged but not detected by them. She thought to herself, "Speed cameras are getting far too advanced." and exhaled nervously, her breath visible in the cold air.
Supergirl stood in front of the door, not able to see through the door and expecting lead anyway, because, well, it's Gotham...
The buzzer sounds and the door clicks open, in what her mind is convincing her to call a sultry manner. Someone on the other end, a bald man with a number of pallid tattoos and an old-fashioned beanie, opens the door for her. "Who is it?" Supergirl, not thinking properly, said, in a clueless voice, "I'm Mae. You know who." "Ya could be anybody, doll! The code!"
Supergirl, now known as "Mae", recites the code, feigning ditzy-ness in her voice and body, "The fish is here to stop the sunrise?" The man sighs, gets off the wooden stool he was sitting on and lets me in. She can see a closed door behind him, a side-door to her right and an enclosed staircase that probably leads to an upper level for maintenance. Looking through the closed door behind him, she sees that it's triple-locked and leads to a downstairs area, the contents of which is shielded by Gotham's signature lead piping, as expected! Mae turns to the man as she switches visions back. He has a cancer spreading throughout his chest which affects his breathing slightly. Mae wonders whether she should tell him. He grabs a key to open the side-door and lets her in, taking a while to find the right key.
Upon entering the warehouse from the side-door, Mae sees that it's a big shadowy room with skylights, the entranceway didn't just look completely enclosed in concrete, it was enclosed in bulky concrete, and that a van is parked in the main room with the back closed. The man who greeted Mae, whom the others greet as Steve, says, "As you can see, the buyer's here. The buyer." They look at Mae. They're all taller than her. The two of them that Steve refers to personally are sitting down on two camping chairs with a wooden box between them, facing the door and the back of the van.
That Mae can see normally, without looking up at the ceiling or switching vision, there are 5 armed people with guns near the van. Three extra people are at the back of the warehouse, and at least one has crutches of some kind. Mae thinks that they must all need the money. Steve says heavily to the sitting duo, "Show some composure."