I second what Jack says.

The average engine when being driven sits at 2500 revs, per minute. If you divide that by says 5 seconds, that's 500 turns, A SECOND. When there's no oil and at that many revolutions, heat and friction kick in straight away.

This is why it is very important to check your engine oil once every two weeks. Things happen sooo fast with cars.

But to confirm, it does sound like big end bearings mate.