This newly released Denver jail video shows a sheriff's deputy provoking a fight with an inmate by throwing taekwondo kicks and punches at him.A Denver sheriff's deputy who provoked a fight with an inmate by using taekwondo kicks and punches has been suspended for 90 days.Deputy Roberto Roena received his suspension July 29 for the fight that occurred in April 2013, according to his disciplinary letter obtained by The Denver Post. Roena was punished for using excessive force and making inaccurate and misleading statements about the incident, the letter said.The 15 months it took to discipline Roena supports a common complaint that it takes too long for deputies to be punished after they break a department policy. A recent Post analysis of disciplinary records from January 2012 to mid-July 2014 found that it takes longer than 10 months for the typical case to be adjudicated.Sheriff's department internal investigators determined that Roena had provoked a fight with inmate John Cardenas, who had a reputation as a violent inmate.According to Roena's disciplinary letter, Cardenas was angry because he and other inmates were told they only had a 30-minute break outside their cells rather than an hour. Cardenas had been making threats, but the deputies guarding the cell appeared to ignore him and had left a sliding security door open.Roena, a 15-year department veteran, was on court duty the day of the fight but had gone to a cell block at the Downtown Detention Center to visit other deputies. He spoke to the other deputies about his fitness and exercise routine, which included martial arts.Roena was a taekwondo instructor and, in 2012, had been invited to Cuba to teach a class on the martial art, the disciplinary letter said.After the fight, Roena wrote in a mandatory use-of-force report that Cardenas was the aggressor.Roena said he responded with defensive tactics, including the side kick, to protect himself.However, the video told a different story, the letter said.