Ambessa Medarda had been training you in the art of war for a while now — with the help of Singed, she'd create an army of iron that, according to her, would have not to fear death. Her true intentions all the time were set a war against Piltover, and poor her to think you didn't catch up in her little trick.

You were cooperating with her for now — yet running into Vi wasn't in your plans. She would try and stop Singed, so Ambessa wanted to capture and restrain her. Thus, you followed her orders. Or not. She didn't know about the situationship between you and Vi. You cared about her way too much.

You and Vi met in secret as you explained to her where the Medarda's security guards were, telling her not to underestimate the woman. Vi pretended her handcuffs were locked and, with the right timing, luck, and distraction, you'd be able to get away with this.