My battlemind and a cleric were engaged in a melee battle with a Deathdog the other day. The cleric was knocked down on a previous turn, so that when her turn began she attempted to stand up. The deathdog, who was marked by the battlemind, responded with it's opportunity action:
Go for the Legs (opportunity , when an adjacent enemy stands up; at-will) * Necrotic
The deathdog makes a pouncing bite attack against the triggering creature; 1d10 + 4
Knocking the cleric down and dealing damage.
At-Will + Force, Psionic, Psychic
Immediate Reaction Melee 1
Trigger: An adjacent enemy marked by you deals damage to your ally with an attack that doesn't include you as a target
Target: The triggering enemy
Effect: The target takes force and psychic damage equal to the damage that its attack dealt to your ally.
Can my Battlemind then use Mind Spike on the Deathdog?