The heel of Mary refers to her crushing the head of the serpent and therefore fighting evil. In this article from Crisis Magazine, Understanding and Combating the Francis Effect, the author describes the problem of Francis and how we should respond.
He has an interesting psychological analysis of the man, Francis.
Honest observers of his reign during the last five years would agree that the what of his agenda has been to pull the Church to the left in many ways, albeit with substantial ambiguity, as evidenced by Amoris Laetitia and many other public statements. Honesty would also dictate that the how of his pontificate—his modus operandi or leadership style—has been to use control, manipulation, and other dictatorial measures to accomplish his goals along with stonewalling, obfuscation, and subterfuge when needed.
…Such scant details still suggest unmet emotional needs (e.g., feeling loved, accepted, and not alone) in his family of origin. As someone who has rubbed shoulders with more than one dictatorial personality in my years in evangelical and evangelical-charismatic circles, I’d bet the house on it.
Being Mary’s Heel in the Day of the Francis Effect
The laity has received much advice in recent months on what to do in our day of scandal and crisis…
Jesus tells us to love our enemies, do good to those who hate us, bless those who curse us, and pray for those who mistreat us. In applying this passage to our day, it means that when the Francis Effect is autocratic, controlling, manipulative, and seeks to instill fear, we need to manifest humility in its myriad dimensions to counteract it.
This is spiritual warfare; it’s in humility that powers, principalities, and wickedness in high places are brought to nothing. It’s in a humiliated Son of Man being crucified on a tree that the works of the devil are destroyed.
The faithful Catholic laity becomes Mary’s Heel when it manifests this spirit of humility in these days of the Francis Effect. The temptation is to become a monster in order to slay the monster.
Sadly, in doing this, you end up with one dead monster, one live one, and the kingdom has not come on earth as it is in heaven.