  The high redshift radiogalaxy 1243+036 (z=3.6) presents an asymmetric Lyman
alpha profile of FWHM 1550 km/s as measured by van Ojik et al. We propose that
the blue asymmetry in the Lyman alpha profile is not due to narrow absorption
dips but consists of narrow emission peaks. We interpret the blueshifted peaks
near -1130, -850 and -550 km/s (relative to the peak of full profile) as being
the result of Fermi acceleration of Lyman alpha produced by jet-induced star
formation in the wake of a 300 km/s shock. This shock would be caused by the
deflection of the radio-jet at the observed position of the radio bend which
also coincides spatially with the excess Lyman alpha emission reported by van
Ojik et al
