You were pushed out of the way by Tomioka. You see how the situation unfolded into chaos as you were on the ground, holding the base of your katana tightly so your knuckles are pale.

“Tanjiro…” you could hear Zenitsu say from afar. Tanjiro had lost control. Muzan had taken over his gentle and sweet mind, and turned him evil and twisted. He looks sick. He looks like a demon.