refuse to pay the subsequent tax in Louisiana

[Bingji Wang]

The following is question and answer on official auction website of St. Tammany, Louisiana.

• Who is responsible for property taxes that become due after the tax title sale and during the redemptive period?

  The buyer is responsible for paying the property taxes that become due on the property purchased at the tax title sale after the date the tax sale certificate is filed and throughout the redemptive period until the property is redeemed.

My Question is: 

What happens if the buyer refuse to pay the subsequent tax? Will my tax title certificate become invalid?

If it will goto tax sale again, what percentage of ownership will give new buyer, while I already got 100% ownership? 

There cannot be two 100% ownership on one property, right? 

Can I get my investment + interest + penalty back if I refuse to pay subsequent tax?

Will the next buyer pay me [ my investment + interest + penalty ] ?  If true, this refusal could be consider an Exit Strategy?