At the 'Avatar: Fire and Ash' premiere in Los Angeles, Jack Champion chats with THR and shares what it was like working closely with Sigourney Weaver and receiving notes from director James Cameron. Plus, he talks about visiting Pandora this time around on a "greater scope." ►►Subscribe for more entertainment news: thr.cm/dwtPxG2 ►► See our latest videos: thr.cm/syLedfw About: The Hollywood Reporter (THR) is the entertainment industry's flagship media brand, offering in-depth reporting, analysis, unparalleled access, world-class photography and video, and feature exclusives in its award-winning weekly magazine and dynamic website. The Hollywood Reporter also boasts prestigious live events, industry-leading philanthropic, empowerment and diversity initiatives and hugely successful video series. Connect with The Hollywood Reporter Online: Visit the website: thr.cm/MgwCFl9 Likes us on Facebook: thr.cm/ngIBL8l Follow us on Twitter: thr.cm/2S875k7 Follo...