When an enemy unit declares a charge, a unit with this ability that is within 6" of one of the charging unit's targets may fire Overwatch as if they were also targeted. A unit that does so cannot fire Overwatch again in this turn.
During deployment, you can set up this unit in a Manta hold instead of placing them on the battlefield. At the end of any of your Movement phases, this unit can use a Manta strike to enter the fray - set it up anywhere on the battlefield that is more than 9" from any enemy models.
If you roll a 6 when taking a Morale test for this unit, the test is automatically passed.