I don’t know if this was asked but if a knack snaps could something jump start it?
They could, but anyone that tries this is going to need a lot of power. Like, archangel level power. Burnouts aren’t easy to heal because of the angel grace the knack draws power from, and if their ability to harness that power snaps, it’s going to need a lot of OOMPH to break back through.
Nixie might have enough power to manage it, she’s able to see the threads and could try and knit them back together proper, but it would be a very difficult healing compared to her normal work.