DENVER - In the NFL, players and fans complain about not knowing what's a catch and what isn't a catch.These days in the NBA, it's what's a foul and what isn't.The Mavericks were left perplexed and angry when they couldn't get called for a foul despite hacking Denver's Gary Harris on his trip downcourt with under 10 seconds to go and the Mavericks trailing by a point.It was a frustrating end to what would be a 105-102 loss that the Mavericks probably lost by being down 23 points in the third quarter before making a furious rally that ultimately came up short.Dennis Smith Jr.