Thanks for the chapter!
Although not mentioned all the witnesses were injured and traumatized during the room's destruction from the powerful forces being unleashed resulting in the area of the room and 1/4 mile around to be completely destroyed leaving behind only a multitude of deep craters. As for the witnesses due to damage and trauma their eyes were shredded, numerous scars carved all over their bodies, and their minds reverted to that of a skittish child with a deep rooted fear of loud noises and flashes of light. While MC only lost all his clothes his opponent had the two top layers of skin burned off and all the bones in his arms reduced to powder. Granted his arms will have to be surgically removed and learn to fight with his legs due to his cultivation advancing 1 level he'll be a really powerhouse in 10-15 years as a result making everything worth it.