The Water Hashira is found at the Battleground, busies himself with his own world; training harshly. He is practicing his Water Breathing styles. Preferring to keep himself at diligent work and sharpening his skills and senses, maintaining a great fluid form of a great Demon Slayer as he motions most of his limbs and katana to perform certain techniques, his sword drawing water lines with his blindingly fast strikes, like waterfall.

"Hah!" Seems like Giyu hasn't noticed you yet.