[Rockstar]

I'm zerg, and lately when a protoss has FFE'd I've just been throwing down a warren, putting my drones back on gas and just build 8ish roach, a bunch of lings and smash him... The most trouble I've had is when they get a VR out, but by that time I generally have breached their wall and have too many lings for them to escape... I also end up having 2 hatch at the end of this, so the all in is dependant on the damage I deal with my strike... I can drone up ridiculously quickly if the attack fails, but to this point it hasn't...

So my question is: What can a protoss do to stop a roach all in, or is it just a checkmate move provided you don't derp it on the micro? Also, if he builds more than 4 cannons to hold it, wouldn't this kind of negate the FFE, considering thats 4+ gateways he doesn't have, 600+ minerals of army he doesn't have,.. and considering I can remax on drones more quickly than he can, wouldn't I be ahead even if the attack failed??