Zangetsu does not just go off and talk. Besides, he smells wet. Something went on. Ichigo knows this stuff!

"...Yeah we'll see about that one." Not so much the people shaped things. Shapechangers? Did zanpakuto spirits ALL change their shapes? He'd been told when Zangetsu takes over he looks very different than the being standing next to him currently.

He's still watching though, because that's ... quite a show, intentional or not. "Riding at night, sounds like. What do you know them from?"