As Tamayo did her stolen blood demon art on Muzan sacrificing her in the process and then Gyomei used his weapon to blow Muzans head off but then..... he regenerated as Gyomei were Fighting Muzan after Tamayo the others, Sanemi is running to the base when Muzan Lit it on fire setting it to explode, And as the others, Muichiro, Shinobu, Obanai, Mitsuri, And then Tanjiro were charging at Muzan helping Gyomei fight Muzan. And then thats when you arrive