When you're going fast expand vs Zerg, Bunkers alone are useless against baneling busts, since you only have single target DPS.
If you're going to fast expand vs Zerg you pretty much need tanks to prevent that, or some kind of hyper-aggression with marines but that involves a lot of control
Next time you do that, get gas on 15, factory ASAP and 2nd gas while it's building and pump out 3-4 tanks which will keep you safe early game. It shouldn't hinder your fast expansion much at all. Of course this will likely make him feel free to take all the expansions he wants, and most probably mutalisks so don't neglect your marine count and aggression to his economy will be necessary after you start benefiting from that 1st expansion.
If you're going to fast expand vs Zerg you pretty much need tanks to prevent that, or some kind of hyper-aggression with marines but that involves a lot of control

Next time you do that, get gas on 15, factory ASAP and 2nd gas while it's building and pump out 3-4 tanks which will keep you safe early game. It shouldn't hinder your fast expansion much at all. Of course this will likely make him feel free to take all the expansions he wants, and most probably mutalisks so don't neglect your marine count and aggression to his economy will be necessary after you start benefiting from that 1st expansion.
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