Yes, I have seen a video about that incident, although I would suggest it supports the view that baptismal preparation doesn't guarantee that the person being baptised is genuinely saved. No pastor can know for sure - it's interesting that Simon the Magician was baptised before he tried to purchase the power of the Holy Spirit (Acts 8:13). I have also seen one person baptised after thorough preparation who promptly got sucked into John Crowder's mysticism, and who has now converted to Judaism.
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Never guaranteed, but before we perform an act of righteousness on them, we need to be as sure as possible