When Sara "Dippity" is in critical mode and has additional armor on the final limb when it is blown off, the Extra Life ability is triggered which means instead of ending the game the player will only discard all of the armor upgrades back to base armor. If the action card Commabackk is played it would not draw any cards because Sara "Dippity" does not have less limbs than earlier in the turn.
If a player uses Virus Flush on their own Regeneration Pod or Scales of Regeneration the armor underneath the pod/scales would become the new active armor. This could be the base armor, or a Level 1,2 or 3 Armor depending on which armor was active when the blow off occurred.
A defending player may respond to the attacking player's declaration of an attack by using Virus Flush on the attack armor. This must be done before the dice are rolled. The attacking player must give the defending player a chance to respond to the declaration before rolling the dice.
If Virus Flush is used, the attacking player will now be able to re-select their move for the turn.