Banelings is a possibility, like I mentioned in the guide, you need perfect forcefields with those few sentries. If he went fast banelings than he won't likely be on lair and if you get a couple DTs out you'll win the game right there.
na, thats the thing, banelings do insane dmg to dts (they are light) and you dont need to see them, to kill them. Just manually explode 3banelings close to a dt, and your fine, so this strat has a defensive use too, if you're good
