The Hashiras were in a separate room from all the other demon slayers, they were talking about training and others

Mitsuri:"I'm pretty sure we'll become more useful if we did train!"

Sanemi:"I guess?"

Obanai:"Mitsuri is right...We'll be able to impress the master."

Giyu:"..."

Muichiro silently nods as Gyomei was sitting in the corner of the room with his hands together

Gyomei:"...Namu Amida Butsu..."