To Bryan, the massive door opening was like the door to some sort of hangar. Unused to the perspective of being so tiny, he unfortunately didn't realize that the swinging door would intersect with his current position until it was almost too late.
"Bryan!" he heard his father call from the other room. Spurred into action, he sprinted for freedom, but the door slammed into his fleeing form anyway, leaving him unhurt but sprawling on the foyer floor.
Then came a titanic echo off his father's call. "Bryan? Brett? Anyone home? It's me, Josh!"
Bryan was unprepared to see such a massive version off his uncle's roommate stepping into the house. From where he lay, he was unable to see his father and younger brother, but he knew that he could get the giant's attention on his own.
"Josh! Hey Josh, down here!"
But Josh was already stepping behind the door to close it, and his trajectory was leading him straight toward the tiny teenager!