Mamdani won 56% of votes, Cuomo 44%. A clear majority win.

https://enr.boenyc.gov/rcv/026916_1.html

Now if you said the GOP was panicking (though why IDK as the city is known Dem territory), or if you said even some within the Dem party itself, or if you said some groups within the city was, I might consider that a reasonable assertion.

But the city is in panic? Doubtful.

Besides, its your claim, not mine. Point being that I have no interest in researching to drum up support for your claim. Not my job.