Today I figured out the best timing for a 2fac vs an FE vs toss. Pretty much FD timing, except you actually double! NO WAY lol. It's pretty easy to keep your tank alive, because you bring a long 4 rines, 2 scvs, and a vulture, not to mention you have two facs rallied to the opponent pumping vultures. And if you're not confident in keeping your tank alive vs 3 goons and a zlot, you can build another tank, but I find it won't be as effective, because 1 tank and 3 vults + remaining rines kills the expo, and can get probes in the main depending on how well you do it. An AI pylon could ruin this, but I think it's unexpecting because it's so fast.