They cooperate as Hogwarts staff members during the final confrontation.
Snape and McGonagall jointly help subdue the impostor in the Hogwarts office.
McGonagall acts as a senior authority protecting Harry from immediate danger.
McGonagall helps stop the impostor just as he is about to kill Harry.
Explore the full interactive character relationship map of Harry Potter and the Goblet of Fire
Related entry on Wikidata (Q192179), public domain (CC0).