How did Vinesh Phogat manage to stun the defending gold medalist?

How did Vinesh Phogat manage to stun the defending gold medalist Yui Susaki of Japan. Phogat later on defeated Ukraine's Oksana Livach and Cuba's Yusneylys Guzmán to reach the finals of Women's Freestyle 50kg

How did Vinesh Phogat manage to stun the defending gold medalist Yui Susaki of Japan. Phogat later on defeated Ukraine's Oksana Livach and Cuba's Yusneylys Guzmán to reach the finals of Women's Freestyle 50kg