It does do what you think it does. Personally I could never use it because healers don't score well at all in arena. It's also locked to 5* Nanna, which although isn't super exclusive, makes it a tough decision when you could just be building another unit when healers perform their roles well enough with their default staff and heal.
The reins are probably just a coincidence, I can't imagine a situation where -def is better than -spd.
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