Mandaram also had not activated his Sharingan, so he didn't care much about appearing as a loser to the people around, and it's not as if it was shameful to lose to an adult when you are a child. Madara, seeing the older man sheathing his sword, did the same, lowering his.
Nevertheless, being a good guy was tough, and Mizuto also felt thirsty after he talked so much. Still, if he was a bad guy, would he be troubled like this? Obviously not, since being a bad guy was so easy, considering he only needed to throw Shido out from the bus, so Shido couldn't talk anymore.
I found the original source. I think author dropped this series. Novel has only 130 or chapter which was updated quite while ago.
Original Novel link: https://mtlnation.com/novel/opened-fifth-gear-on-the-sabaody-ground-kizaru-is-numb
Katniss, hearing the whispers around her, looked at Jacob in surprise. She had never thought he would put on such a great performance. He managed to deceive everyone in such a short time. She was familiar with the look of fear, pain, and expressions of astonishment, so Jacob was definitely dying, but she had to admit he did a good job at it.
The Orb of Worlds without Limits: Alice in Borderland