Aha, a place the rules differ from Pathfinder! They can't use Deflect Arrows while Flatfooted and they haven't acted yet, you have to use it against an attack from a ranged weapon so it doesn't even work, and a person would probably count as a Massive Weapon anyway so it doesn't work a second time!
...I assume it's just a slightly different rule, but I thought it worth pointing out.
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