What can Google return fire with? Plenty. For instance they acquired Motorolla Mobility which holds a bunch of very important mobile device patents that Apple has initially been found to be violating. Google will be forced to become a legal expert now and Im sure this and many future filings from them will sting Apple at its core revenue stream this summer / fall.
If Google cannot sell their Android appliances, it will hurt their ego but not dent their revenue. If Apple cannot sell their iOS devices, they lose almost everything.