[Game play] Zac Q damage doesn't proc on some pulls

So I've been noticing a lot that Zac's 2nd part of his Q, when he causes 2 units to collide into each other, does not do damage if they do not actually physically collide. This is very frustrating because the distance the two units travel is very low, despite the visual range of the affect. 1 of two things needs to happen. 1) Actually keep the units in movement until they actually collide. 2) Do damage despite not actually colliding. This is the only skill that I can think of where you can actually perform the skill that is suppose to do but doesn't do any damage. You removed half the damage for a 2 part skill, we want our 2nd half.