https://vimeo.com/1681859823:45-4:30 are a couple of fairly typical examples in an empty hand context. Either dragging something over the legs for a takedown, or trapping in between to cause damage. The fact that a spear is involved doesn't change the concept.
Also worth noting that just because something appears in a modern wushu form doesn't mean it ever existed there in a classical context. Most of what we know as martial arts today came about long after spears were relevant as a primary form of military combat.
Ian C. Kuzushi wrote:I've posted some examples in the past.
If you can point me there easily, I'd love to see those. If it's work for you, though, please don't worry about it.