The main issue is not about the Mantle holder alone, the issue is that the Enemy dots will ram up over time.
Kill off the current mantle wielder –> gets Enemy 3.
Winter retaliates by sending a contingent of Fae to make our lives as miserable as posible, with the idea of final death not too far off their minds.
We fight off and stopped their assault on our mids –> Winter loses face for failing to stop us.
Winter is really rankled by our insistence to still beating our heart, so it tries to send a Kill-squad to our home. Additional casualties in the form of family members are acceptable.
One of our family member gets hurt, or Molly stopped their assult once more –> Defcon 1 for Winter.
At this point, it is utterly sickened by us killing off its assets, failing to do its objectives and being a constant thorn up its side. That's it, kid's gloves are taken off. Froze their bank accounts, make it so that they receive social stigmas, heck if they can make it so that they are responsible to a heinous criminal act.
On and on this will go.
We can still mend relation with Winter. Enemy 3 is when they actively try and pull the gun on us. And these beings have a wide array of resources, they can hit us where we least expect it.