Loop kill off a long serve

How do you preform a loop kill (a really fast topspin) off a serve with either topspin/sidespin or backspin?

Is it any different from a regular topspin? a loop kill?

I have seen your vids on topspin, but the ball isnt that fast. 

Hi Sally,

To get more speed you need to get the contact faster and a little flatter.

To topspin off a long spin serve, it is good to get a fast brushing action on the stroke.  By brushing the ball heavily you will negate the spin on the serve and get the ball spinning the way you want it to.

The shorter the amount of time the ball is on your bat the less effect the spin of the serve will have. So try to get a very thin fast contact on the ball.