It's pretty simple, actually. This is on insane, by the way.
Hold down the forwards button on the loading screen. Unsheath your knife as you run, and jump onto the pedestal. By the time you're on top, both rabbits will be turned away. Throw your knife; it will kill one rabbit. Run to him, remove your knife, face the other rabbit, and hit the throw key. If you're lucky, you will get a quick bullseye and the second rabbit will die.
The first few times I did this, I got times in the 8-10 second range, but I kept at it, and finally got 6 seconds. I'll give a cookie to anyone who can beat 6 seconds! Yay, cyber cookies!
![Very Happy :D](./images/smilies/icon_biggrin.gif)