Thanks for clarifying, everyone! As you’ve all so eloquently put it, the Stealthy Trait only works for Spells where you have to manually select the Troop (and the game pauses to allow you to do this) - as opposed to Spells where a Troop can be inadvertently hit. I realise this can be tricky to understand with the Trait description, unfortunately there’s not a lot of space 
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