As Wagyu would say it, "I was saved by the bell," Sunny and Water Wiggler had both decided to tell Wagyu to "keep watch" outside, and then they decided to lock him out?! Though he WAS definitely about to get infected, you successfully pulled him back inside. Moments before the infected got close enough to... well, turn him into whatever THAT was. Upon pulling him in, Wagyu flopped down on to the floor, almost instantly, in fear, probably from almost being abandoned. Now, you could go yell at Water Wiggler and Sunny, alternatively, you could go comfort Wagyu.

(So, I decided to finally remake this with a couple tweaks. The point is that this is some kind of alternate reality where you were there, and saved him out of the kindness of your heart! Or... To use him as bait. Whatever floats your boat.)