The St. Louis Blue do not have the best record when it comes to letting players go and not having them exact revenge when they see the Note the next time. History is littered with examples.
Curtis Joseph might have been the biggest one. You never really heard anything public that Joseph was upset with the franchise when he left, but he took advantage of any perceived mistreatment every time out. Not only did he seem to win every game against the Blues, but it felt like he was impossible to score against.
Brendan Shanahan was the same, minus the scoring against part.