Took me about 10 tries with this build. Just needs a bit of practice.

Run through the center first and collect all 4 packs, activate Snow Globe when pretty much everything is hit. As soon as the knights run to the Plump Spirit, use the whistle. Once the Snow Globe has run out, use pepper spray and charge pepper spray via the weapon at the same time. Try to time it so that you can slow down the knights for as long as possible.
As soon as the knights run back to the Plump Spirits, use the whistle again. Continue to time Snow Globe and Pepper Spray and kite the knights.

I hope it helps you.

Lv 89, 13756 Power

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