Please Feel Free to Beat This Man Bloody.
Gilman hadn't expected the walls to come down. He froze, disbelieving, when they did. Even if his mind had been twisted past breaking, he still had lucid moments, and he knew there had been witnesses to what he'd done with Serena. He'd done what he'd had to do, unlike the rest of them, but they wouldn't see it that way. They would've seen how Serena had reacted to it.
They would've been keenly aware that he had raped her and then left her to cry.
Maybe, though... just maybe, they'd be too busy trying to find a way out to come after him. He climbed as high up in his tree as he could, his muscles cramping from perching like he was for so long. Gilman could still reach the tubes to keep himself healthy, but if they did decide to come after him, he was... pretty screwed. There was nowhere to go, and nothing he could use to fight them off with.
Gilman just made himself very small and very quiet and didn't make a sound.