  The massive young stellar object (MYSO) G358.93-0.03-MM1 showed an
extraordinary near-infrared- to (sub-)millimetre-dark and far-infrared-loud
accretion burst, which is closely associated with flares of several class II
methanol maser transitions, and, later, a 22 GHz water maser flare. Water maser
flares provide an invaluable insight into ejection events associated with
accretion bursts. Although the short timescale of the 22 GHz water maser flare
made it impossible to carry out a very long baseline interferometry
observation, we could track it with the Karl G. Jansky Very Large Array (VLA).
The evolution of the spatial structure of the 22 GHz water masers and their
association with the continuum sources in the region is studied with the VLA
during two epochs, pre- and post-H2O maser flare. A drastic change in the
distribution of the water masers is revealed: in contrast to the four maser
groups detected during epoch I, only two newly formed clusters are detected
during epoch II. The 22 GHz water masers associated with the bursting source
MM1 changed in morphology and emission velocity extent. Clear evidence of the
influence of the accretion burst on the ejection from G358.93-0.03-MM1 is
presented. The accretion event has also potentially affected a region with a
radius of ~2'' (~13 500 AU at 6.75 kpc), suppressing water masers associated
with other point sources in this region.
