In the mix of the celebration I can see how Danny was bummed after the game and went there but ran into Miami Heat party guys. Nothing wrong with that.
I know Danny was pretty stressed out after that devastating loss and so was everyone on the Spurs team so I don't know except Danny was feeling he needed to have some time off after all the stress and Pop left them in Miami overnight so I don't see anything wrong with that.
The problem was that Miami is not that big of a city so to go to a place and not expect to run into other celebrities that is not a coincident. Oh well.... I am sure Danny never meant that to happen on purpose though....