It was very pointy but the foreground cloud was round???
Anyway no matter how it formed it certainly grabbed my attention :-)
I ran inside quickly to get my camera and took a picture and used a Canon G7x mark 11 on manual focus
on the 31st March 2022.
There is some excellent information on how cloud shadows are formed on Les Cowley ‘Atmospheric Optics’ Website’ at: https://www.atoptics.co.uk/atoptics/rayim13.htm