Marc Stein: Mavericks legend Dirk Nowitzki on the Luka Dončić trade: “Really couldn’t believe it.” More: “I’ll never be a Laker fan but I’ll always be a Luka fan. … I’m happy I went to support him.” Nowitzki is speaking Friday night at a long-scheduled live appearance hosted by @dfwticket . More NBA from me: http://tinyurl.com/yrmzrx83