  Magnetars, the likely sources of Fast Radio Bursts (FRBs), produce both
steady highly relativistic magnetized winds, and occasional ejection events. We
demonstrate that the requirement of conservation of the magnetic flux dominates
the overall dynamics of magnetic explosions. This is missed in conventional
hydrodynamic models of the ejections as expanding shell with parametrically
added magnetic field, as well as one-dimensional models of magnetic
disturbances. Most of the initial free energy of an explosion is actually spent
on stretching its own internal magnetic field, while doing minimal $pdV$ work
against the surrounding. Magnetic explosions from magnetars come into force
balance with the pre-flares wind close to the light cylinder. They are then
advected quietly with the wind, or propagate as electromagnetic disturbances.
No powerful shock waves are generated in the wind.
