WAKEFIELD — A 25-year-old Charlestown man accused by the police of preying on an “incapacitated and unconscious” woman has been indicted by a Washington County grand jury on a charge of first-degree sexual assault.The man, Kyle M. Log, of 92 Lauri Drive, was arrested on July 15 and has been in home confinement equipped with a monitoring device since the conclusion of his two-day bail hearing in Washington County Superior Court on Aug. 1. He is scheduled for arraignment on Sept. 30. Log, who is represented by attorney Michael J. Zarella, has not entered a plea to the felony charge. The case is being prosecuted by Assistant Attorney General Mark Trovato. Log’s bail hearing before Judge Melanie Wilk Thunberg included potential witnesses at a trial should the case not be settled before it reaches that stage. Among those to take the stand was the alleged victim. Police said that on July 15, Log, Joseph Vilandre, Tyler Manning, and Manning’s girlfriend gathered for a several-hour ride on a pontoon boat on Pasquisset Pond in Charlestown. Manning and Vilandre testified during the bail hearing that the four of them had been drinking alcohol throughout the day and that the woman was highly intoxicated.Vilandre testified that the woman was “barely awake” and “pretty incapacitated” during the boat ride, and that she had her head on Manning’s lap. She was asleep on the pontoon bench when they returned from the trip, he said.Vilandre said he and Manning left the boat for a while, with Log remaining onboard with the woman, who had passed out. He said they had not been gone for long. When they returned, Vilandre said, they viewed Log in a compromising position on top of the “incapacitated” woman. “It was an awkward situation,” he said.Both men testified that they yelled at Log as he was about 6 inches away from the woman and hunched over her. They said they screamed and asked what he was doing. They said at that time he backed away.Vilandre said the woman was still passed out when they carried her off the boat, and that she couldn’t speak and was unaware of her surroundings. The men said that after they brought the woman home and she was feeling better, she realized what had happened and wanted to file charges.Zarella pointed out that the woman had been swimming in her underwear and then “skinny dipping” earlier in the day, an assertion acknowledged by both men. Thunberg overruled the lawyer when he began to suggest that the woman might have been “flaunting.”Law enforcement officials have said they have strong evidence in the case.