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That's from one of the side-story, No Regrets. It comes in OVA and manga form.
I'd really recommend reading it because it does have differences to the animated version that make small, but important changes to the characters, including this specific scene.
I just search it on amazon uk and it was the 3rd result: https://www.amazon.co.uk/Attack-Titan-No-Regrets-Color/dp/1632365324/ref=sr_1_3?dchild=1&keywords=attack+on+titan+no+regrets&qid=1620223668&sr=8-3
English release October 24 https://www.amazon.com/gp/product/1632365324/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1