Aldon Smith is a beastly rookie, and he’s neck-and-neck with Von Miller for the Defensive Rookie of the Year Award. After a sluggish start in which he didn’t record a sack or tackle in his first three games, the defensive end now has 9.5 sacks, which gives him sole possession of eighth overall in the league’s sack standings, and puts the first-round pick just one sack behind Miller.

Yesterday Smith recorded two sacks during San Francisco’s 26-0 trouncing of St. Louis, and he gets style points for his fourth quarter sack after he hauled A.J. Feeley down and then almost immediately sprinted off the field, becoming the anti-Stevie Johnson.

After the game Smith explained the tame celebration, saying that he’s a bad man.

From the San Francisco Chronicle:

When he sat, 49ers linebacker Tavares Gooden made a safe sign, indicating that Smith was safe in baseball terms.

“You know, like you’re in trouble, you run home real quick and sit down somewhere,” Smith said.

Once he sat down, many expected Smith to burst out some sort of dance. Instead, nothing.

“I was tired,” Smith said. “That was a long sprint.”

The subdued, non-celebration was a vast departure from Smith’s jubilance after a major world event last spring that was kind of a big deal…