>>11916536As of my last knowledge update in September 2021, I do not have information about a specific event or storyline involving Chris Jericho and MJF within the context of professional wrestling, specifically in AEW (All Elite Wrestling) or any other promotion. Storylines and character developments in professional wrestling can change rapidly, and it's not uncommon for wrestlers to switch between being a heel (villain) and a face (fan favorite) as part of ongoing story arcs.
If such a storyline occurred after my last knowledge update, it would be best to consult recent sources, AEW's official broadcasts, or statements from the wrestlers involved for a detailed understanding of the storyline and who might be responsible for turning MJF into a face or a heel. Wrestling storylines often involve multiple creative inputs from both wrestlers and the promotion itself.