The text for Retributive Stike says:
You protect your ally and strike your foe. The ally gains resistance to all damage against the triggering damage equal to 2 + your level. If the foe is within reach, make a melee Strike against it.
Does that mean that I have to spend one of my three actions for this melee strike or is it an extra strike?
And if I already made multiple attacks in this round do I get a Multiple Attack Penalty on this attack?