dirk has a soft mind just like most of us tbh. dude dug his head in his arms when the ref blew the final whistle in game 6 of the 2011 finals, because he was also moved to tears just like us and he didn't want the world to see that.

you don't see many players celebrating the championship that way, by comparison, the celts just went riot and got drunk as after winning the championship in 08.
dirk's mental softness relapsed in game 6 that year, though he looked rather tough in the previous games both mentally and physically. he missed every shot he attempted in the 1st half and went 0-10 something from the field, dude had a poor game that night which was fair to say, but thankfully your role players all stood up and rescued this team from what could've been a replica of the 06' tragedy. dirk just showed one more time that his mind couldn't stand such heavy pressure imho, when he was only one game away from winning his first ring ever.