Shathra seems to have the same sort of Morlun-esque vulnerability to mystical energies only. Peter smacked her around without the Other and it didn't bother her. Kaine couldn't hurt her either. Other could, in both cases. I'd argue Eddie is stronger/faster/etc but I just don't think he has the tools required to put her down. Essentially he loses this due to power rock/paper/scissors.
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