Erick, you are assuming that because something is spiralling, in the original statement, it is forces. That is not clear because it was not explicitly stated as forces. So my question is "what
is spiralling?". Until that is answered, shearing forces is looking for a nail when you are a hammer. Whenever someone asks me a questions nowadays that I don't know the answer to, I always say, "It is either angular momentum or shearing forces." Inside joke.