[SkyBreaker]

I'm not an expert in PvZ; it's my least favoured match-up. However in the times that I have had both my gas-geysers stolen I've opted for opening with two gateways and putting some early pressure on with zealots. Assuming he doesn't cancel the two geysers; that's 150minerals he's not going to have for spine crawlers and/or zerglings as defence. In my opinion; using your first few units to attack the geysers your opponent has stolen just buys him time to continue macroing which is something you never want to let a Zerg do.

To quote Day[9]; "Just go ******* kill him".