Came across this interesting HEMA perspective on sickle fighting, well reasoned and applied.
Noticeable similarities to other arts such as WC, particularly the positioning and use of non weapon hand to block/pull and trap.
Also shows how curved design of the sickle creates dangerous situations where normal counters to other weapons such as knives would result in wounding.
https://youtu.be/CbGKh1Kfe2s