The sensible thing would be to push Otoha off or redirect his jumping slash to the side once she has her lance up to halt the slash. Instead Q'uila goes with the momentum and collapses towards the floor to try and throw him off balance at the lack of expected resistance and, when she's nearly horizontal, digs the tip of her lance into the floor and heaves using the leverage to flip Otoha to the side so that the miqo'te is straddling him and forcing the body of her lance down towards his neck in a move that would certainly injure his windpipe if his sword wasn't still trapped between them.