[theo_luddite]

From that camera angle at normal speed it's hard to spot but he was stood in an offside position for a while. When he gets it, Löwe has got back level with him. Took a while, but managed to pause the YouTube video at the right moment. There has to be two players between (or level) with you and the goal. Normally one of those is the keeper so it's just another defender. The keeper wasn't part of this so it needs two defenders to play him onside. There was only one, the lad on the line.