Depends on the overall physical state of the witless.
I personally knew a witness who died after bloodless heart surgery. Before my cancer surgery I was in such dire state the anaesthetist said I was in trouble, and surgery could not go ahead without it. I was not prepared to throw my life on the table like a cheap plastic gambling chip - especially as I know the Gibbering Baddies could have voted that Jehoobie sock puppet had changed his ever changing mind 6 months previously.