If it ran completely dry it would not have gotten you home. It got hot and cooked though since there was too little oil to shed the heat of the engine. There might be life in the engine though, if you flush it with mechanics engine flush to get rid of the sticky sludge and carbon, then change the oil and filter. The engine probably had 2 quarts in it, maybe a little more- it just couldn't reach the dipstick. When you refill the oil you might use an additive that says it frees sticky valves and rings. If the engine is running, keep your money in your pocket. If the noise gets louder, death in inevitable for that engine. Changing the engine will beat you for a couple of thousand bucks and a used engine from the auto salvage. If it doesn't get louder or the noise goes away, your guardian angel is flying with you still.