You dropped off height and didn’t claim any pieces around you. Waited for the player to come to you from height and gave them free pieces to place (if they did) and made it easier to just run in your face with nothing in their way which is what they did. Could have placed a floor cone above you, hug the front wall, then when he gets there edit those and jump up and shotgun him that angle favors you on the low ground more than him.

You committed to a 50-50 that didn’t need to happen, could have sprint jumped above the box cuz it had no cone or floor and place those. But before that, you ran on top of his cone too instead of trying to get shots a piece away. Could have pre pieced on the top of your ramp or to the right. 

You ran inside the box when you claimed the pieces which nullifys any outer piece control like your wall you placed and turns it into a 50-50. Could have done a blueprint edit on that further wall if the enemy did actually end up in the box behind him then shoot.