Charlie was panicking so much over being a dog that he missed what happened.
The door to the room suddenly opened and a bunch of armed guards ran into the room. Almost immediately, Matt the rhino charged into them, while Amy the hawk flew around the room to avoid being shot at. In a matter of seconds, all of the guards were dead, crushed by Matt's rhino form.
But Charlie missed all of that. He was too busy panicking, wondering if he would ever be human again. Everything seemed so real. Yet again, he had a hard time believing that this was all just a video game and wasn't really happening.
Suddenly, Charlie felt strange. But it was different than when he turned into a dog. And in no time at all, he was back to his original form. He had no reason to panic or worry that he would be stuck as a dog. The transmogrification was just temporary.
He looked around the room. The door was open and no one was trying to kill them. And just like him, Matt and Amy were back to normal.
"Did something happen?" Charlie asked.