They got to a spot and just like a handbag, Gandalf clung onto Zagan and didn't want to let go.
"Here it is. The only way out of the underworld is here. But it has been sealed by the god of the underworld and no one can leave or come in when thought his permission. It's confusing how you managed to come in." Gandalf wondered.
Zagan pointed at another opening. "There, I came from there." Gandalf stared at the opening suspiciously. That opening wasn't there a while ago and he had never noticed anything like it before in his entire life.
Zagan walked towards the door then turned to look at Gandalf. "What? You change your mind?"
Gandalf ran up to him and asked. "Then how do I conceal my wing?" Zagan thought for a moment then realized that there's nothing to worry about.
"Just ignore it. Humans are dumb they'll think it's a costume." he shrugged and walked into the door disappearing out of sight.