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You have to input the c-stick direction while you're in shield stun to do it perfectly. But since people don't shield pressure frame perfect you actually gain a few frames yourself to buffer something out (i.e. even if you input your roll 1 or 2 frames late you'll be fine most of the time vs. extended shield pressure in practice) to get out of it. Even though you're not "buffering" it technically if you do it late but you get me?lets say a fox is drill shining on my shield, if i buffer roll or jump, do i get shined, is there timing, i dont understand
Actually, while arguing about frame data in some Westballz thread I learned you can actually buffer a roll out of every single pressure string OTHER than a fresh Fox double shine (so you can roll before the 3rd shine of a tripple shine or the 4th etc. you can roll as long as the shine isn't fresh [and it's basically never going to be fresh] AND it's not the second shine. My point is you can pretty much always roll unless Fox just died and he double shines your shield starting with a fresh shine.). IIRC literally everything else as far as space animal shield pressure goes is subject to being checked with buffered role or spot doge as long as you do it while you're in shield stun.
I'm not sure if you can buffer a roll out of a frame perfect Fox or Falco shine->grab (it matters since Fox's shine has less stun but he jumps faster and Falco's shine has more stun and he jumps slower) but I am pretty sure you can.
Look at where the gaps are though (this isn't entirely "correct" or at least it's not all encompassing but what it says is true/right for its purpose):
http://www.smashboards.com/threads/shield-pressure-frame-data.278616/
In a nutshell, your fastest option (rolling which is invincible on the 4th frame, or a spot doge which is faster but keeps you in place) is generally faster than their tightest option (a late nair followed by a shine or etc.). You can also more easily do your option frame perfect more than they can. This increasingly becomes in your favor since basically everything they hit your shield with is stale (so they lose a frame or two of shield stun while their lag stays the same from landing or jumping or whatever) so you get slightly bigger windows.
edit:
And jumping OOS can be good too, depends though. I'll have to think about that and ask around though to figure out how much you can move your hurtbox per frame and things like that.
Also I mess around with buffering a jump OOS with the c-stick for a shine OOS with Fox. But I usually use the control stick since I practiced double shining that way. I will say that it's a better motion to move the c-stick up and push B (and hold down) to shine. You barely have to move your thumb from the top of the c-stick to B (With Falco I use Y sometimes since his is easy). That's probably the best way to do consistent grounded shines OOS, with Fox at least. But I get by just using up on the control stick to shine OOS. I buffer everything else though.