There was something that particularly concerned him—Thomas, the middleman, had gone missing. Previously, after Hughes had called Thomas, he would have returned the call, but these past two days, Hughes had made two or three calls with still no contact whatsoever.
Although the mastermind behind this was not particularly clever, they had indeed acted ruthlessly. Due to the presence of an insider, they clearly knew that Jimmy was the main force in that night's operation. They probably knew of Jimmy's profile too, arranging for several people to travel from the southern border to New York for such a high-risk assassination—clearly, substantial means were behind this.
Moreover, even knowing Jimmy's exceptional combat skills, they had still dared to proceed. He must have had something to rely on, so what would he do after the mission failed? Would he lay low, or would he assemble more manpower for another attempt?