I think you died of thirst and hunger from the "burial" death. Not sure if the Indians would come back each day and force feed you, which the Persians did with Scaphism. Scaphism is horrendous because you would probably eventually die of deep infection and blood poisoning, which would take many days. The Wikipedia link mentions it taking someone 17 days to finally die. Imagine insects crawling inside your skin after they've been laid to hatch, or they've entered through your mucous membranes, including your asshole.