Use primary e11 shots and move as much as you can while shooting. Sadly since the deflect change you can't beat it by going close since it will still deflect and you will just die.
Not sure how often you play proj but when you get hit, your scope and your shot goes wide.
Not to mention that, as a hero, you are either dead or half hp after poping out into a prefire.
If they hit ground before dying you wont get the kill. Most of the time when you shoot someone they still touch the ground before falling so it counts as falling to death.