Sounds like the wind caught it and you twisted to acomodate and twisted your back muscles!
You can do the same thing by not bending your legs when you lift!
I hurt my back muscles once and just kept on working till I couldn't stand erect anymore!!
Went to a Chiro and he exrayed my back and showed me the exrays!! My muscles were showing up on the exrays!!!
Muscels don't normally show up on exrays but because I wouldn't shut down by myself,the brain was flooding my back muscels with calcium to stiffin me up and shut me down!!
He gave me placibo calcium and put me at rest and my back sraightened up!!!
You hurt yourself enough the old brain will take over to put you at rest!!
When I take a shower I take the last part of it with the shower head pointed at my lower back as hot as I can stand it while arms outstreched on the other wall while leaning in a slow walk!!
Works for me even after crawling off a roof after putting on many squares of shingles!~!
Bob