Vs ogres

“Morning,” Percy said grimly. “Beautiful day, huh?” He wore the same clothes as the day before — jeans, his purple T-shirt, and Polartec jacket — but they’d obviously been freshly washed. He held his sword in one hand and a garden hose in the other. Why there was a garden hose on the roof, Frank wasn’t sure, but every time the giants sent up a cannonball, Percy summoned a high-powered blast of water and detonated the sphere in midair.

Percy readied the garden hose. “I’ve got one more trick up my sleeve. Your lawn has a sprinkler system. I can blow it up and cause some confusion down there, but that’ll destroy your water pressure. No pressure, no hose, and those cannonballs are going to plow right into the house.” Hazel’s praise was still ringing in Frank’s ears, making it difficult to think. Dozens of ogres were camped on his lawn, waiting to tear him apart

Percy gunned the engine. They shot out of the garage before it was fully open, leaving a Cadillac-shaped hole of splintered wood.
The ogres ran to intercept, but Percy shouted at the top of his lungs, and the irrigation system exploded. A hundred geysers shot into the air along with clods of dirt, pieces of pipe, and very heavy sprinkler heads.

SoN ch.37