Also, I suspect that, like Hayate, most of Rein's spells are aria-types. With the drones closing on her like that, she might well simply not have been able to get one off in time. Probably she could have managed anyway, but the risk was legitimate and she was only supposed to be scouting anyway, so.
Ja, -n
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"I'm terribly sorry, but I have to kill you quite horribly now."
Ja, -n
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"I'm terribly sorry, but I have to kill you quite horribly now."