Something about how loudly Edwin says Charles' name in this scene has been driving me insane and I think I've finally figured out why.
When Charles finds Edwin in hell, Edwin is rolled into a little ball of misery, covered in blood and quietly sobbing. It's probably a position he's developed over decades, making himself as small as possible, being as quiet as possible, trying to take up as little space as possible. He's almost pretending he doesn't exist in order to stretch out the moments before the spider finds him and the loop starts again.
And then Charles says his name and Edwin looks up and sees Charles, and it's like all of his defenses just vanish. He doesn't whisper Charles' name, he says it, loudly, as if he has completely forgotten where he is and that they need to be quiet. He gets up, unfurls his limbs, slowly standing up to his full height, taking up space again. Every instinct in his body should tell him to stay hidden and as invisible and silent as possible, but Charles has just smiled at him, and Edwin speaks again, asking "Is that you?" and letting out a shaky breath of relief.
He is completely vulnerable and exposed now, like Charles' arrival has made him completely forget that they are in hell and that he could be ripped apart by a spider doll demon at any moment. All the defences he has built up over literal decades just completely crumble as soon as he hears Charles' voice.
And then the spider comes and rips him away, and I don’t think it would have done (at least not yet), had Edwin not alerted it to his presence like that. I think that’s why this moment wouldn’t let go of me, because I always thought it shouldn’t be this easy for Edwin to abandon a survival tactic he has developed over decades of torture. But all it takes is Charles being there, and Edwin forgets everything else.