Per wiki policy, Spoilers Off applies here and all spoilers are unmarked. You Have Been Warned.
I love you, Dad...
- Owen's phone call to his father after seeing Abby's demonic form in the basement. He's obviously confused and frightened by what he saw and calls his father for advice/comfort. When he asks his father whether people can be evil, fearing that Abby, the only person who is kind to him, is evil, he reacts angrily. He accuses Owen of letting his mother fill his head with religious dogma and letting her turn him against him, totally ignoring his own son's obvious distress and audible crying. He doesn't even take the time to respond to Owen's saying "I love you, dad" before slamming the phone down. Realizing that his own father doesn't want him, Owen breaks down sobbing.
- Before that Owen tried to talk to his mother. Throughout the rest of the film, she's shown to be a very poor mother frequently ignoring Owen so she can get drunk or watch TV. When Owen comes to her, he calls out to her quietly by saying "mum", but realising she's passed out, he then addresses her again, but this time his voice is much quieter, even pleading to her.
- The aftermath of the police officer's murder by Abby. Owen's in a state of shock over seeing his girlfriend kill someone. Abby then informs a heartbroken Owen that she needs to leave before giving him one last kiss. The camera then shows Owen walk out quietly, before panning to the basement Owen and Abby played in, implying that Owen hid or helped Abby hide the body for her. Later that evening, when Owen sees Abby get in the taxi, he still shows no emotion, but by the next morning, he starts to break down. A culmination of the trauma of seeing someone murdered in front of him, losing the only person who was kind to him so soon after meeting her, and the knowledge that he's going back to his old life of being ignored and abused by everyone around him catches up to him, and he finally bursts into tears, crying his little heart out.
- When Owen goes into Abby's apartment and sees the pictures of Abby and a boy, who is heavily implied to be Thomas as a child, he starts to get frightened at another reminder that Abby isn't human, and he is also angry at the thought that he might just be a replacement for Thomas. He starts to walk out but Abby blocks him not wanting him to leave her. When Owen protests he wants to leave and then asks whether she would hurt him to stop him from going, Abby looks genuinely heartbroken at the thought of her new friend being afraid of her and wanting to leave her. So she lets him go, telling him sadly "I told you we couldn't be friends."
- Thomas death. Abby scales the hospital until she's at the window of his room. The second he sees her he gets up despite being in utter agony and opens the window for her. When she gently asks him to invite her in he shows that his injuries are so bad that he's no longer capable of speech. Abby looks heartbroken at seeing her friend reduced to such a horrible state and guilty over how badly she treated him throughout the film. Knowing that his life is over, he offers her his neck for her to feed off of.
- While primarily horrifying, Owen's bullying scenes are also very upsetting to watch. In particular, there is the scene where right after he happily writes down notes to share with Abby, Kenny follows him to the toilets with an antenna before whipping and scarring him. By the end, Owen is physically shaking from the pain and terror. It's a heartbreaking reminder that Owen can never relax or be allowed a moment of pleasure in his life.
