What happens to Pax when Runt runs into the field in Chapter 19?

When Runt runs into the field, Pax pounces on the wire. As Pax strips off the sheathing, a streak of light blows through the earth. The current shatters one of his back teeth, sears his bottom lip, scorches his throat, and sizzles down his spine. Pax is knocked off the ledge, and he cannot hear or smell.