The Serpent Tail Insect that Shalu encountered was inevitably an Obsession Demon. Then, this meets Angel's requirements for the experiment.
He asked in detail about Shalu's battle with the Serpent Tail Insect inside the House of the Heart.
Angel left no detail unchecked, as Shalu's situation served as a reference for Toby.
After Shalu repeated the events that occurred inside several times, Angel finally stopped him.
Shalu's account somewhat relieved Angel. His biggest worry was if Toby entered the House of the Heart and faced the Extreme Resentment Thoughts, unable to defeat them, and eventually got defeated, causing damage to his original consciousness.
However, according to Shalu, he battled the Serpent Tail Insect in the Colosseum of Pillars and eventually died within its jaws. He thought he was completely dead, only to open his eyes and discover that his previous experience was just an Illusion Dream.
