Counter-attack If a unit contains at least one model with this special rule, and that unit is charged, every model with the Counter-attack special rule in the unit gets +1 Attack until the end of the phase.
If, when charged, the unit was already locked in combat, the Counter-attack special rule has no effect.
Acute Senses If a unit contains at least one model with this special rule, and that unit arrives on a random table edge (due to Outflank, or other special rules), then you can re-roll to see which table edge they arrive from.