By August 2014, Finley had reached out to the F.B.I.’s Atlanta field office, asking if the bureau could help with a swatting case in which the suspect was a minor. He was told the swatter would have to be ‘‘prolific.’’ Finley asked what that meant. He knew the swatter had made hoax calls to 11 police departments in that one January alone. How many swattings is prolific? No one Finley spoke to at the bureau could say. But Finley kept tracking Obnoxious, kept calling the F.B.I. with updates — he could connect the guy to 20 swatting calls, then 30 calls. When he got past 40 about a month later, he finally found a special agent named Andrew Young. Forty was definitely prolific.