Anyone, on any side of the debate, claiming ‘conclusive’ knowledge of what was taking place inside this woman’s head when she died is -at the very best- making educated guesses. There is a very good chance that Terri was incapable of ‘feeling’ anything, as indicated by her autopsy report. There is a very small chance that she was capable of feeling everything. Either way, no one knows conclusively and to claim to know the ‘truth’ is facetious.
You certainly wouldn’t want to believe your lying ewyes, where just weeks before her execution was carried out she is seen on video to move her head and follow a balloon. No siree, got to maintain the lie at all costs.