Yes, that's what I'm referring to. You don't consider that severe damage to a mirror segment? It looks like somebody shot it with a gun. It's unable to get properly back into alignment over the full segment.
It's not really an issue since it's only a minute reduction in light gathering power and the active optics was able to correct the mirror deformation after re-calibration.
Speaking of telescope being shot with a gun.. There is a telescope in Texas (Harlan J. Smith Telescope at McDonald observatory) that was shot a few times by someone in the 1970s in the hopes of shattering the main mirror. The overall effect however was only a 1% reduction in the light gathering power and the telescope is still in regular use today. You can find a picture of the primary mirror here [1].
If you check the reporting on the incident, they are able to calibrate almost all of this away and use the telescope as normal. It's bad but not that bad. That the telescope would be hit was expected so it can account for this amount of damage.
