  We investigate the propagation of magnons after ultrashort perturbations of
the exchange interaction in the prototype two-dimensional Heisenberg
antiferromagnet. Using the recently proposed neural quantum states, we predict
highly anisotropic spreading in space constrained by the symmetry of the
perturbation. Interestingly, the propagation speed at the shortest length and
time scale is significantly higher than the highest magnon velocity. We argue
that the enhancement stems from extraordinary strong magnon-magnon
interactions, suggesting new avenues for manipulating information transfer on
ultrashort length and time scales.
