@bobobird, thanks sir! My aim before going to the boxing was to keep the shutter up 1/400 but the lighting of the place was not good, so iso 1600 wasn't really enough. I was thinking back then to boost iso to 3200 or even 6400 but i was surrounded by a lot of pixel peepers, so I got scared lol.
About the 6th pic, yeah you're right, a tight crop is needed to show his anguished face. This guy threw the towel, and was almost hospitalized.
@brain mechanic, thanks sir! love that black and white shot of the inside of a barn(?) lol filled with funny graffiti!