Here is "Night Guard Tests Water" using a Bow-Arrow Stance instead of a Single-Leg Stance as in the set

Kungfu, armed or unarmed, is alive; we should not limit ourselves to rigidity. If a pattern is performed in a Single-Leg Stance in a set, for example, it does not mean that we must always use it in that stance. If the situation warrants it, we may perform the same pattern in a different stance, as in the pattern "Night Guard Tests Sea" performed here in a Bow-Arrow Stance whereas it appears in the Sword set in a Single-Leg Stance. Sometimes a different name is used when the stance changes, especially when this happens often; sometimes the same name is retained.

The pattern "Jade Belt Circles Waist" is a horizontal sweep against an opponent's waist. But it can also be used against other parts of an opponent's body, as well as a slicing instead of a sweeping attack.