As above, but no additional information. Based on description (below), it is quite possible the officer was trying to forcible remove items from her mouth. Clip credit to user at YT.
Description from original site ..... "This was few years ago when I lived on Dalston Junction. The women was on the floor you see him punch her as I zoom in. She was a drug dealer and apparently had swallowed a bag of drugs probably Paracetamol. He was telling her to open her mouth, then repeatedly bang her one in the head."
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