Samantha had taken the men by surprise, but by the time Nick made his entrance, they were starting to catch on. Enough that things very quickly escalated following the moment that the two men Samantha had hit fell to the ground writhing and right around the time Nick threw his first punch.
Having to react quickly because it did look like at least a couple of them were trying to bring guns to a fist fight, Samantha launched herself foot first into some guy's solar plexus and while he was doubled over wheezing, she flipped around and aimed her Widow's Bite at one of them as they aimed their gun at Nick's back. Electricity sparked from his neck where the Bite found its target and he crumpled to the ground immobilized, gun skidding across the concrete for someone else to grab.
"What is that supposed to mean?" Samantha snapped in Nick's general direction as she punched someone else in the face, though it was entirely possible she was picturing herself punching someone else in the moment.
Was he seriously trying to start this with her? Now? Nick wasn't going to like her pissed about this either, he was lucky she was currently preoccupied. "And watch your six!"