The initial reports I saw were that he "self-monitored," not quarantined. Reports that he went bowling in Williamsburg were published even before his Ebola test results were back. From the NY Post itself (link):
Craig Spencer, who was was suffering from Ebola-like symptoms a 103-degree fever and nausea spent Wednesday night bowling in Williamsburg, the sources said. He used Uber taxis to get there and back.
. . .
Test results should be available in the next 12 hours, they added.
As health officials wait for the results to come in, the case is being treated as if it were already confirmed, according to council member Mark Levine, who represents Spencers neighborhood.
He was hospitalized by the time of that Post article
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If I had 103-degree fever and nausea, I doubt I'd want to go bowling.
Just sayin'...........