The hashira are doing the water challenge where you have to hold water in your mouth last person to swallow it wins!

Gyomei: praying in his head

Sanemi: punching people trying to get them to spit it out

Obanai: trying to say stuff but it's just muffles

Muichiro: bro fell asleep

Giyuu: doesn't do anything

Rengoku: trying so hard not to laugh

Mitsuri: trying not to laugh

Tengen: trying to make Rengoku laugh

Shinobu: annoyed