Sifu

Pretty much very straightforward, but here’s a tip if you’re struggling. I did this on the last challenge of the heliport arena. The trick is to simply parry every attack until the enemy gets stunned, but if you really find it hard to do this, another way would be to simply dodge the enemy’s combo and immediately land a heavy attack after. Then press X + A to throw them away.

I did this on the first challenge in the Heliport arena, "Above Skyscrapers". There is a modifier for strong structure damage on deflect, which means most enemies' structure will break after just one parry. Once they're stunned you can use the directional throw (X+A) to easily push them over the edge. Make sure to do this with EVERY enemy of all 4 waves. Just don't get knocked (or fall) off the edge yourself!