Nunchucks in la calle

Last night after salsa there was a fight between a guy with nunchucks and another guy. Then two guys came behind the guy with the nunchucks and knocked him out in the middle of the street and hastened away. We were on the other side of the street, not knowing who was in the right or whatever but it was a surreal scene. I think the guy knocked out might have been a food vendor but I don´t know it was across the other side of the pio nono bridge so I actually don´t know what went wrong.