Webdemon slayer season 3 episode 5 picks up right after muichiro managed to save kotetsu from one of gyokko's demonic creations, and soon after he rescues.
Webdemon slayer season 3 has been diving into the mist hashira muichiro tokito's past with the latest episodes of the anime, but the flashback from the newest.
Webgyokko had muichiro on the ropes with his blood demon art, trapping the mist hashira in a vase full of water that nearly drowned him.