Violence in sports

South Korea's Lee Jingyu (29), of the combined Koreas team, falls as she passes the puck against Haruna Yoneyama (10), of Japan, during the first period of the preliminary round of the women's hockey game at the 2018 Winter Olympics in Gangneung, South Korea, Wednesday, Feb. 14, 2018. (AP Photo/Matt Slocum)

FILE - In this Oct. 19, 2011 file photo, former South Korean comfort women who were forced to serve for the Japanese Army as sexual slaves during World War II, stage a rally to demand an official apology and compensation from the Japanese government in front of the Japanese Embassy in Seoul, South Korea. The fierce grudges over historical persecution and a thousand perceived national and cultural slights cannot be untwined from the sports for many Koreans, and these swirling emotions will be front and center Wednesday, Feb. 14, 2018, when a combined team of North and South Koreans plays regional power Japan in women’s hockey. (AP Photo/Ahn Young-joon, File)

FILE - In this Oct. 19, 2011 file photo, former South Korean comfort women who were forced to serve for the Japanese Army as sexual slaves during World War II, stage a rally to demand an official apology and compensation from the Japanese government in front of the Japanese Embassy in Seoul, South Korea. The fierce grudges over historical persecution and a thousand perceived national and cultural slights cannot be untwined from the sports for many Koreans, and these swirling emotions will be front and center Wednesday, Feb. 14, 2018, when a combined team of North and South Koreans plays regional power Japan in women’s hockey. (AP Photo/Ahn Young-joon, File)

FILE - In this Oct. 19, 2011 file photo, former South Korean comfort women who were forced to serve for the Japanese Army as sexual slaves during World War II, stage a rally to demand an official apology and compensation from the Japanese government in front of the Japanese Embassy in Seoul, South Korea. The fierce grudges over historical persecution and a thousand perceived national and cultural slights cannot be untwined from the sports for many Koreans, and these swirling emotions will be front and center Wednesday, Feb. 14, 2018, when a combined team of North and South Koreans plays regional power Japan in women’s hockey. (AP Photo/Ahn Young-joon, File)

Philadelphia Eagles center Jason Kelce, right, arrives in front of the Philadelphia Museum of Art after a Super Bowl victory parade for the Philadelphia Eagles football team, Thursday, Feb. 8, 2018, in Philadelphia. The Eagles beat the New England Patriots 41-33 in Super Bowl 52. (AP Photo/Alex Brandon)

Detroit Pistons center Willie Reed (33) grabs a rebound as Portland Trail Blazers forward Caleb Swanigan (50) defends during the second half of an NBA basketball game, Monday, Feb. 5, 2018, in Detroit. (AP Photo/Carlos Osorio)

FILE - This Sept. 12, 2015, file photo, shows Michigan State athletics director Mark Hollis, at left. This Nov. 9, 2012 file photo, shows Michigan State University President Lou Anna K. Simon, at right. Hollis announced his retirement Friday, Jan. 26,m 2018, the second university official to step down in as many days amid sharp criticism over the school's handling of sexual abuse allegations against disgraced sports doctor Larry Nassar. Michigan State President Lou Anna Simon submitted her resignation late Wednesday, Jan. 24, hours after Nassar, a former employee at Michigan State, was sentenced to 40 to 175 years in prison for molesting young girls and women under the guise of medical treatment. (AP Photo/Al Goldis, left, Carlos Osorio, right, File)

FILE - This Sept. 12, 2015, file photo, shows Michigan State athletics director Mark Hollis, at left. This Nov. 9, 2012 file photo, shows Michigan State University President Lou Anna K. Simon, at right. Hollis announced his retirement Friday, Jan. 26,m 2018, the second university official to step down in as many days amid sharp criticism over the school's handling of sexual abuse allegations against disgraced sports doctor Larry Nassar. Michigan State President Lou Anna Simon submitted her resignation late Wednesday, Jan. 24, hours after Nassar, a former employee at Michigan State, was sentenced to 40 to 175 years in prison for molesting young girls and women under the guise of medical treatment. (AP Photo/Al Goldis, left, Carlos Osorio, right, File)

New England Patriots fans cheer during the second half of the AFC championship NFL football game between the Patriots and the Jacksonville Jaguars, Sunday, Jan. 21, 2018, in Foxborough, Mass. (AP Photo/Winslow Townson)

Manchester City's Leroy Sane reacts at the end of the English Premier League soccer match between Liverpool and Manchester City at Anfield Stadium, in Liverpool, England, Sunday Jan. 14, 2018. (AP Photo/Dave Thompson)