Well I think it would have the potential for other effects than just being possibly OP. Instead of having to learn to drift, chase, turn on, and run from, opponents, someone gets a shadow or assassin and bam! Now all they have to do is equip huge amounts of damage, their charge weapon of choice, and learn to hit people off screen, now they can take down pretty much anyone.
Swole, you always talk about pvp taking skill this would futher take out that "skill," or rather make it less appealing to learn. I realize not everyone will do this and learn to pvp without that specific strategy, however that strategy is going to be very appealing to anyone struggling to learn pvp movements, because of how simple it is
All that isn't even mentioning the fact that trolls would abuse it to camp or surprise attack people in PvP systems.