SPARTAN of FEAR:im hoping off now continue this thread i will be back in a few hours 2 c how this is going just post counters not annything about me being noob 4 not attacking 1st just counters ok
And in your defense, I'm not saying you're a noob for not attacking first, although this was probably your best option. Look, I'm trying to make some very generous assumptions. Namely, for better or worse, you didn't see this coming, so what do you do when you don't see it coming?
Strict counters to six scarabs are the same as counters to any vehicle: ODST spam using rocket ability, fully upgraded cobra's entrenched and supported by powers (ice, carpet bomb), probably even hawks or vultures using Y ability. The thing is you realize that they are fielding 18,000 in equipment. That's 20 vultures. Use Y, retreat and repeat.
What I'm really trying to address though is this: if you didn't see it coming, you probably don't have 18,000 in counters. Everybody knows how to kill six scarabs if you have time to build 18,000 in counters. The real question you pose is how to turn the entire situation around, and killing the scarabs isn't enough really, because they'd still have their bases, and even in the best scenario they'd probably have killed some of yours unless you had the counters already in place.
So, six scarabs that you didn't see coming, how do you buy time and what do you build? You buy time by attacking their base and avoiding combat until you're fielding about as much anti-vehicle weaponry as they have invested in the scarabs. Meanwhile you are losing bases, so you need to make them lose bases.
When there are six scarabs in your base, their base is weak because of pop limits. So, not to keep repeating myself, but I'm not saying you need to "attack 1st", I'm saying you need to attack when you realized there were six scarabs. Exploit the weakness, and that's the bases. It buys you time; it levels the playing field; it's your best option.