Naturally, when the horde of very impressive, evil robots come, they attack New York. Granted, Natasha should probably be grateful as it saves on the commute when she can just roll out of bed and basically fall on top of one without really trying. But she's starting to feel sorry for the long-suffering New Yorkers. There's still construction going on somewhere in the city to repair whatever the Chitauri tore through in their quest for world domination. These are the times when Natasha's surprised that the general public doesn't hate them more.
They strike in the middle of the night. Stark Tower is hit first. It makes such an impressive target that Natasha's hardly surprised. Tony is furious though. They just got everything fixed after the Chitauri attack. Thankfully, they're soon able to turn the attack away, but what starts out as a single building sized robot quickly turns into three, and as if that isn't bad enough they each launch a swarm of smaller robots, ranging from mostly human sized down to roughly the size (and shape) of footballs. And soon they've their hands full merely running interference; Iron Man, Thor and the Hulk focusing on the big targets which leaves Natasha, Clint and Steve fielding the smaller ones.
At first, the destruction seems random, but soon a pattern emerges. Clint is the one who picks up on it first. They're hitting anywhere with advanced technology or rare metals. He's perched on a rooftop with an extra supply of arrows, alerting everyone of their movements and taking out as many as is humanly possible. While Steve and Natasha are running through the streets doing what they can to keep the bigger ones from doing too much damage. They've managed to thin out the herd quite a bit already and the ones left seem to have mostly banded together. Except Natasha's lost track of them. Which is ridiculous, considering their size.
There's a crash from about a block down, and Natasha hurries, her sturdy boots slapping against the pavement. Running past a high rise, she skids to a halt when she catches the large hole blown into the wall by the revolving doors out of the corner of her eye. Adrenaline floods through her veins in a surge of triumph. Later, when the battle is done, she'll pay for it with exhaustion and trembling muscles. But, right now she feels invincible. Her fingers tap the comm in her ear. "Captain, they've gone into the Seneca building. I'm in pursuit."
Gun drawn, she walks through the hole in the wall, shoulders tightening as she sweeps the lobby for any stragglers. She can hear them tearing through the building in the distance, but she doesn't particularly want to be caught unaware by a lingering robot. At this time of night, the building will be mostly empty but for the security guards in the lobby and either they'll have fled (their pay grade probably doesn't cover robot attacks) or they're already dead. Regardless, they're nowhere to be seen. "They're on the move, going up," she says in a low voice before hurrying across the vast and too open lobby. Following them in here won't be an issue; they've left a trail of destruction in their wake. The dim lights though aren't ideal, and she swipes a hefty looking flashlight from the security desk on her way.