Zilean VS Yasuo

I'm wondering if anyone else noticed that when you "doublebomb" a yasuo as zilean, he can windwall your first bomb after it connects... even AFTER you cast a follow up bomb. I have seen yasuo mains counter my cc AND pre-emptive damage by waiting to windwall till my second bomb. While I understand the cc should be blocked (well played yasuo), I feel that my first bomb (the one that connected) should remain to do its damage. I feel cheated out of the perfectly executed bomb that lands first because yasuo gets to wait until my combo completes.