How does your scenario play out?
Mine is bombing Zillas face, penetrating his eyes repeatably until the brain is reached in wave after wave.
Even if his eyeballs are superhard or something, they should be able to enter through the iris, considering his size, maybe even walk/swim through his eye stems, reaching the brain. Once there, with enough ducks, alive or dead, he should suffer more and more brain-damage. Grisly stuff.
A lot are going to die in the beams until he is blind at least, so there are probably quite a few millions there alone.