Elementalist Lux Bug?

Hitting enemies out of sight doesn't fill her element bar any

lv1, game start: sitting in river, i see an enemy pass by as he goes into Fog, i throw a Q over a wall. I walk to the wall and ward over, i see the enemy trapped in my Q i specifically check my Element bar to see how much one hit increased it, but it said 0%, even though i has just SEEN an enemy in my Q prison