Reactions can be taken after you have Passed.

After you have Passed in the Action Phase the only Actions you may take are Reactions. To take a Reaction, move an Influence Disc from your Influence Track to the space on the Reaction Track of your Summary Tile that corresponds to the chosen Reaction. The possible Reactions are:

Upgrade: Execute one Upgrade Activation.

or

Build: Execute one Build Activation.

or

Move: Execute one Move Activation.

Techs granting extra Activations do not apply to Reactions!

Related Rule(s)