It's just mechanics. It doesn't have to be anything ethereal.
And another attempt to get the train back on the rails goes down in flames.
Does it strike nobody else that the OP's question is very odd? The ratio of people who get on the mat with overly stiff arms to those who get on the mat with overly limp arms is, it seems to me, about 1000:0.
I'd sort of like to hear from the OP if she's tried any of the advice and how it went for her.