If you had a bane nest and saw him morphing you could have made 10 banelings of your own. If he came in a clump you could have used 2-4 banelings to annihilate his entire force. If he comes spread out then you can snipe his banelings with a spine + 2 queens or roaches.
If you have none of these then you've done something wrong! Most likely just droning too hard without scouting to see what he was doing!
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