Not too many spinners enjoy bowling with the new ball, inside the power-play overs, especially in the shortest format. If they're forced to do so, they become flatter and quicker. Ashwin doesn't sacrifice flight to contain the batsman.
Change formats, but Ashwin wouldn't change his attitude towards bowling. The standout feature of his nine wickets at the Ferozshah Kotla was the line and pace at which he bowled. He enticed the batsman to play against the spin and through off-side, hoping to induce a mistake. He rarely thought twice before tossing up the ball and challenged the batsmen to use their feet to smother the spin.
Mushtaq Ahmed once said that even though spinners bowl a lot slower in the air, they should have the attitude of a fast bowler. Ashwin seems to have lapped up the advice well.