It comes across very much like sarcasm, as clearly, he was not vigilant. However, he did act as a diversion for the witches, which did turn out to be very useful.
A group of witches. They put him into a deep sleep.
They both shared the same name, so when called by the witches, it was Thelyphron (our protagonist) who answered the call.
They reached in through a hole in the bedroom.
They replaced them with wax simulacra.
By using an Egyptian mystic, Zatchlas, to communicate with the soul of the deceased.