Team OTTplay
Kagaya Ubuyashiki burnt his family down with explosives the minute Muzan attacked. With this, he also gave his last moments to slow down Muzan's attack on the innocent.
Furious with (but aware of) how the events unfolded, Stone Hashira Gyomei Himejima launches an attack to hold Muzan down till sunrise. He goes solo, till he doesn't.
Mist Hashira Muichiro Tokito sees Himejima and decides he has to join the battle. He does, with all other Hashira.
Butterfly Hashira Shinobu Kocho and Love Hashira Mitsuri Kanroji keep their distance but also attack without any fear, on learning about Ubuyashiki's demise.
Wiind Hashira Sanemi Shinazugawa cannot stand what just happened. He dashes on the battlefield. Tanjiro Kamado is in no mood to sit back and watch with folded hands either.
Like other Hashira, Serpent Hashira Obanai Iguro is furious. His temper and skills match Sanemi's. Thus, you can expect him to not spare Muzan after what just transpired.
After staying in hiding for way too long, Water Hashira Giyu Tomioka decides it is time to face the challenges head-on. Thus, he comes back just as Muzan dared to enter Ubuyashiki residence, and kill Kagaya.
Just as all the Hashira lined up to defeat Muzan, he changed the game. He changed the battlefield and now all the Hashira and the trainee fall into void. Tanjiro, nonetheless, challenges him to a duet.