One thing I do not understand is the JW use of the world "impale". Typically that word is resurved for something besides being nailed to a tree.
As an execution form, impalement typically meant being pierced bodilly, through either the torso, or more gruesomely, though the anus (or vagina in rare cases) with a sharpened stake that exited the upper body, most likely through a shoulder. With either method, victims could be supported upon the sharpened stake as it was raised to vertical, taking a long time to die. Vlad Tepes was rather fond of this method. I don't see any other religions mentioning Jesus' impalement. One wonders about the Watchtower's fascination with the word, when they don't really even tell their believers what it implies.