Units don't lose HP during execution
Units that are being executed in torture chamber don't lose HP. Their HP petals could be an easy way to tell how close they are to dying and producing spirit.
Game Version:
Steam Public
Platform:
Windows
I may be mistaken, as I have not used the torture chamber for a while, but I believe that there is a progress circle above the unit. If I am correct here then it is the same as is used when units are converted. It is much easier to see the circle and much more consistent with the conversion method, but if the circle is missing then I would definitely support the idea of adding the health petals.