  We use high quality VLT/MUSE data to study the kinematics and the ionized gas
properties of Haro 11, a well known starburst merger system and the closest
confirmed Lyman continuum leaking galaxy. We present results from integrated
line maps, and from maps in three velocity bins comprising the blueshifted,
systemic and redshifted emission. The kinematic analysis reveals complex
velocities resulting from the interplay of virial motions and momentum
feedback. Star formation happens intensively in three compact knots (knots A, B
and C), but one, knot C, dominates the energy released in supernovae. The halo
is characterised by low gas density and extinction, but with large temperature
variations, coincident with fast shock regions. Moreover, we find large
temperature discrepancies in knot C, when using different temperature-sensitive
lines. The relative impact of the knots in the metal enrichment differs. While
knot B is strongly enriching its closest surrounding, knot C is likely the main
distributor of metals in the halo. In knot A, part of the metal enriched gas
seems to escape through low density channels towards the south. We compare the
metallicities from two methods and find large discrepancies in knot C, a
shocked area, and the highly ionized zones, that we partially attribute to the
effect of shocks. This work shows, that traditional relations developed from
averaged measurements or simplified methods, fail to probe the diverse
conditions of the gas in extreme environments. We need robust relations that
include realistic models where several physical processes are simultaneously at
work.
