With his official role as San Antonio's "Coach of whatever he feels like," Tim Duncan stopped by the Spurs' practice on Monday and took part in a friendly, yet competitive game of one-on-one with Pau Gasol.

According to the San Antonio Express News' Jeff McDonald, this was not a normal one-on-one game. Duncan only played defense and would get a point when Gasol missed a shot. Abiding by these rules, when all was said and done, the two ended up in a tie.

But perhaps the most stunning aspect of the one-on-one matchup, Duncan fouled Gasol at one point and actually owned up to it, something he was loathe to do during his illustrious playing career.

Somewhere former official and the bane of Duncan's existence, Joey Crawford's jaw just hit the floor.

Even in retirement, Duncan continues to amaze.