13 letters Moral lapse that is reflected literally by the answers at 17-, 24-, 46- and 54-Across Answer: BROKENPROMISE
13 letters Hamlet's dilemma ... with a phonetic hint for the last words of 17- and 29-Across and the first words of 45- and 63-Across Answer: TOBEORNOTTOBE
13 letters Result of not following through (of which there are four examples in this puzzle's grid) Answer: BROKENPROMISE
13 letters "Look out!" ... and warning when encountering the circled things in this puzzle Answer: WATCHYOURSTEP