Semenyo struck twice as Bournemouth won 3-1 to go second on the Premier League table.
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Redknapp said on Sky Sports: "It was a hard night to play football but it didn't matter to Semenyo. He just glides across that surface. An incredible, unique talent. So fantastic to see.
"Doesn't matter if it's right foot, left foot, makes no difference for him.
"A brilliant night for Bournemouth, because they were struggling at one point and you thought, 'How are they going to turn this around?'
"But when you have that number 24 in your team, you have a chance."