Maybe John grabs the first person he sees in the hall. It's Jack, he can't understand a word John is saying in his panicked voice but he hears Kyle shouting in the room and he's just happy that the lads are glad to see him so he goes in, because hey, maybe they have some biscuits (he just ran out) or perhaps Kyle's snuck in an Instagram "model" or two - yeah, maybe that's why John seems so anxious. Maybe they even have both girls AND biscuits!
Kyle stops him a few feet in. Then John, hiding behind Jack and peeking over his shoulder, reaches over and points across the room. Disappointingly, there are neither girls nor biscuits, but Jack sees *IT* from 10 feet away. He looks at it like he looked at that map of England and promptly turns, nimbly ducking out of John's grasp, and slips out the door. No hysterics, just a big nope.
Kyle immediately trails Jack out of the room. John, momentarily frozen with fear, suddenly remembers how to walk and swiftly follows as he shouts "WALKS!!! NononoNO! NO! DO NOT LEAVE ME ALONE IN HERE!!!"