Ya I’m watching it on tv like the rest of us, and I don’t know crap, but I see in some bad car accidents, when the patient hits the steering wheel at a high rate of speed, they’ll sometimes suffer an aortic rupture. Either the heart suffers a tear, which isn’t good, or a valve tears which is worse. It looked like he was hit in the chest (heart) area with a violent blow..With the caveat that I have no idea what Hamlin’s condition is, and this isn’t even speculation—it’s just an answer to your question: traumatic cardiac arrest could potentially make someone’s heart stop following blunt force trauma to the chest.
I really hope Hamlin is okay and pulls through this. Very, very scary situation.
Again, I don’t know what happened, just purely speculating and wishing the best for Mr Hamlin.