I T STARTED at one thirty on a cold Tuesday morning in January when Martin Turner, street performer and, in his own words, apprentice gigolo, tripped over a body in front of the West Portico of St. Paul’s at Covent Garden. Martin, who was none too sober himself, at first thought the body was that of one of the many celebrants who had chosen the Piazza as a convenient outdoor toilet and dormitory. Being a seasoned Londoner, Martin gave the body the “London once-over”—a quick glance to determine whether this was a drunk, a crazy or a human being in distress. The fact that it was entirely possible for someone to be all three simultaneously is why good-Samaritanism in London is considered an extreme sport—like BASE jumping or crocodile wrestling. Martin, noting the good quality coat and shoes, had just pegged the body as a drunk when he noticed that it was in fact missing its head.
As Martin noted, to the detectives conducting his interview, it was a good thing he’d been inebriated, because otherwise he would have wasted time screaming and running about—especially once he realized he was standing in a pool of blood. Instead, with the slow methodical patience of the drunk and terrified, Martin Turner dialed 999 and asked for the police.
from Midnight Riot
I still don't understand why is there a comma if it meant to say what Martin pointed to the detective, shouldn't it be like "As Martin noted to the detectives"?