Remove the And all condition block.
The only time you ever need an and all condition block is inside an Or condition block.
You should also null target and caster after de-indexing them.
Like this.
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Set Rsla_Caster[Rsla_Index] = Rsla_Caster[Rsla_MaxIndex]
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Set Rsla_Caster[Rsla_MaxIndex] = No unit
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Set Rsla_Target[Rsla_Index] = Rsla_Target[Rsla_MaxIndex]
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Set Rsla_Target[Rsla_MaxIndex] = No unit
Instead of using Turn off this trigger you should use the trigger directly.
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Trigger - Turn off Rushing Slash Loop <gen>