there is a reason why permanent "thorns" effects are usually avoided or lowered in twitch based PVP games.
though... i loved pvp matches between two guardian class player in tabula rasa. ping-pong damage
but there wasn't any assets at risk
i could also imagine,
that "mirror bulkheads", which are currently totally useless and overpriced, would deflect lasers at flat angle hits without any damage dealt.