By definition, a combat situation where you are the only one able to move and act while everyone else is frozen stiff is NOT tactical.
If you mean "while everyone else is frozen stiff and never able to move," then yes that would not be tactical. But that is not the case in a TB system. Which definition are you referring to, by the way?
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One can be tactical ONLY in a dynamic situation (i.e. real time) and never in a static situation (i.e. TB).
Wouldn't chess fall under a TB system? Is chess not tactical and strategic?