Shut-in

If you are the defender, play this tactic during
the Priority phase of any round, after Roll for
Priority, but before Ready Fighters. If you aren't
the defender, discard this tactic and select another.
Open doors on the battlefield immediately close.
Doors with a terminal become locked. Closed
doors without a terminal also become locked but
can only be opened by force, either by targeting
with attacks or by performing a Force Door
(Basic) action. If there are fewer than three doors,
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