"Impale" 

The source quoted does not use the word "impale", which is very strange in this context.  The word "impale", which is derived from Latin pālus (stake), means "to pierce with a sharp stake or point" ( The American Heritage Dictionary of the English Language: Fourth Edition.  2000). A person can be "impaled on a stake" if he is pushed on to its point.  Since the stake the Jehovah's Witnesses have in mind seems not to be pointed, or at least not to have been used for piercing the body of Jesus, would it not be better to use "fastened" or "pierced" or some such word, rather than "impaled", for what was done to his hands (in the sense of the Greek word χεῖρες) and his feet?