Will change you to zerk or battlestance depending on your combat situation

/run if UnitAffectingCombat("player") then CastSpellByName("Berserker Stance"); else CastSpellByName("Battle Stance"); end;

Intercept if combat, else Battle Stance

/run if UnitAffectingCombat("player") then CastSpellByName("Intercept"); else CastSpellByName("Battle Stance"); end;