[@Delta44], [@BreakingMe]
The two students, aside from Irvine, follow Ken's example. Irvine just kind of stands there, doing nothing, but the zombies turn their attention away from him and follow Ken and the others. Ken, Kansas and the rest of the students stand outside, the schoolyard spreading for a square mile or two before ending with the fence... Which hundreds upon thousands of infected were pressing their rotting bodies against, trying to break through and find any tasty treats that reside there.