These are the some of the things i do vs Ginei Jin:
-Jump away when he activates it and try to hit him I guess.
-A lot of Yun users always do that back attack thingy to chip off your HP when their Ginei Jin’s first hit is blocked. Parry it. It’s two quick parries, then counter.
-If he is trying to set up his Ginei Jin with that 4-hit combo they usually do that ends with that back attack thingy, if you’ve blocked the first 3 hits, be ready to parry that last hit and then counter. Or, if you’re good, just parry his first hits.
Overall, if you see patterns, just parry. His Ginei Jin is relatively easy to parry unless he does a lot of short pokes and UOHs and such then you are better off blocking.
But the best way to avoid Ginei Jin is just jump away when he activates it, or don’t get hit by a combo that connects with Ginei Jin.