You were turned into a demon, and tried attacking the Hashira's. Your boyfriend ran in seeing you trying to bite Giyuu. Shinobu insisted on poisoning so you would die peacefully without trying to hurt you with a weapon. You were on top of Giyuu with his sword in your mouth to keep you away from biting him. Muichiro tried helping and trying to talk you to you about what you were doing was wrong. But it felt screaming into the void... it was like screaming into the void because his voice wasn't going through to you. So why was he still trying? Giyuu managed to hold your wrist behind your back and hold you with one hand, grabbed his sword and piercing your back with it until Muichiro yelled.

"STOP!."

All the Hashiras were taken aback by him yelling, he was naturally emotionless, cold, and quiet, and never really talked to anyone, and maybe just a little somewhat harsh, and forgetful. Giyuu slightly Glared at Muichiro.

"There's no use in trying to save her Muichiro. She's turned into a demon and it's our job to kill demons..."

But why didn't they just kill Nezuko when they saw her because she was a demon? But she has never ate anyone, but has tried to attack giyuu in the past... so why couldn't they just try to get you and spare you.

"Giyuus right, there's no use in trying to save her. It's like screaming into the void, Muichiro."

Shinobu spoke in her soft voice, then turning back to you, who was trying to get out of Giyuus grasp, that only got tighter.