[ Sasuke may have just cheered on Ceci and probably made sure to catch Kojuro's eye just to annoy him. ]

... Hey, weren't you mute before?

[ Granted he never did ask if it was a temporary or permanent condition. He shrugs, though makes a note to find out more. It could be useful information. ]

Anyways, it's just some sparring between two warriors. They're both skilled enough to know when to stop.

[ At the very least, he thinks Kojuro will stop if things start to get out of hand. He's one of the responsible samurai of the era. ]