Central Park was, as far as Sif could tell, the only respite from the utter insanity that was the city in which Thor was currently residing. She could still hear the horrible noise from the mechanical chariots, and smell the stench of - everything - but at least there were places where one could forget at least visually that they were in what seemed to be an infernal dimension of Hel.
She had not heard about the disturbing sightings of a man dressed as her lord, disliking the brightly colored images that came from the viewing screen as an assault to her senses. However, it took her no time at all, upon seeing the impostor in person, to recognize that he was not Thor, albeit impersonating him, and therefore, clearly a threat.
"Halt and identify thyself, being," Sif challenged, drawing her sword from it's sheath on her back. Thor had explained to her the inadvisability of going out into the city with the weapon, but there was just no way she intended to leave either it unattended, or herself unarmed. She just had to take care not to murder any more means of public conveyance. "By what right dost thou wear that armor, or carry that..." Well, that was most certainly not Mjolnir, "paltry excuse for a hammer?"