How do kickboxers take a hard sucker knee without injury?

punch (8)

30/12/2022 09:51

A knee is definitely stronger than a punch, so I am not sure which is more painful: a sucker punch (unflexed) or a prepared knee (flexed).

But a sucker knee is like the worst of both worlds - the giver probably used a lot of strength even if not full force trying to win by KO - how does the receiver not end up in hospital when his insides are smushed after getting caught off guard like this?
https://scontent.fsin4-1.fna.fbcdn.net/v/t39.30808-6/322088101_534897078565235_4935277143383433210_n.jpg?_nc_cat=101&ccb=1-7&_nc_sid=0debeb&_nc_ohc=7jI4XuImf_UAX8TV18r&_nc_ht=scontent.fsin4-1.fna&oh=00_AfBGCu31GWnlob43TKdhKECnn2ZASY_TyzntVCUUTockhw&oe=63B307D8

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