What happens when Reaper loses sight of his Shadow Step destination?

What happens when Reaper loses sight of his Shadow Step destination? - Empty stairs on street in daylight

Let's say a Reaper has already started teleporting with his Shadow Step, and a Mei places a wall right in front him. What happens to the teleport?

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What happens when Reaper loses sight of his Shadow Step destination? - Man with bag on autumn street

What happens when Reaper loses sight of his Shadow Step destination? - Black and white of crop anonymous people in casual outfits walking near building with staircase

What happens when Reaper loses sight of his Shadow Step destination? - Woman sitting on stair in railway station

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Images: Jill Burrow, Barbara Olsen, Mitchell Luo, Dayvison de Oliveira Silva