[@Quatro] Well, the idea was that for the damage transferal to work, there has to be a visible reflection present on the barrier [i]at the time[/i] the attack connects with it. So someone with superhuman strength, for example, could answer Zeshin's Quirk by chucking big enough things to completely cover each barrier (rocks, trees, tables, doors... things like that, as long as they're solid). Attacking whilst invisible could potentially counter the Quirk as well. And I highly doubt poison damage can be reflected either, just name things off the top of my head. I probably should've mentioned this in the app itself, now that I think about it :\

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But yeah, it only works against attacks. So I can see Zeshin not doing so hot at non-combative missions and the like.