  Filament eruption on 30 April - 1 May 2010, which shows the reconnection of
one filament leg with a region far away from its initial position, is analyzed.
Observations from three viewpoints are used for as precise as possible
measurements of endpoint coordinates. The northern leg of the erupting
prominence loop 'jumps' laterally to the latitude lower than the latitude of
the originally southern endpoint. Thus, the endpoints reshuffled their
positions in the limb view. Although this behaviour could be interpreted as the
asymmetric zipping-like eruption, it does not look very likely. It seems more
likely to be reconnection of the flux-rope field lines in its northern leg with
ambient coronal magnetic field lines rooted in a quiet region far from the
filament. From calculations of coronal potential magnetic field, we found that
the filament before the eruption was stable for vertical displacements, but was
liable to violation of the horizontal equilibrium. This is unusual initiation
of an eruption with combination of initial horizontal and vertical flux-rope
displacements showing a new unexpected possibility for the start of an eruptive
event.

Solar and Stellar Astrophysics