You don't get a shield back. The attack itself only did 2 damage. The third damage came from a card ability.Out of interest: Plasma torps remove an extra shield. So if they dealt two damage and then ability triggers, does the reinforced deflector kick in or not?
"After you suffer 3 or more damage from an attack regain a shield"
Surely resolving the effect of plasma torpedo (removing shield) still counts as part of the attack , this means you have suffered 3 damage and so should trigger the deflectors.