The Wesker-Flick Guide
So, it doesn't seem to be a widely known feature of Wesker, but a few people have figured out how to change the trajectory that you will toss a survivor to with his power.
As a quick starting note: I DID NOT DISCOVER THIS TECHNIQUE. The person who discovered it first (whoever it may have been) is the one who deserves the credit for this.
All that out of the way, how does one pull this off?
It's actually quite simple. You'll notice that, while bounding, you can turn your camera while dashing forward. Without any add-ons adjusting your range, (i.e. no RPD Shoulder Walkie or Unicorn Medallion) you will have roughly 45 degrees of turning range (left and right) for your first bound. The second bound gives you a lot more leeway to look around at about 90 degrees left or right.
This feature is crucial to this technique, which would not function if this wasn't allowed.
The way to perform the flick is to turn your camera as far as possible before you collide with the survivor you're targeting. This will give you the most time possible to turn your camera, and as such the most offset from their original trajectory. This tech can be used to turn a throw to nothing into a slam against a wall. I advise mainly doing this with the second bound as it gives the most bang for your buck, but if you can't quite slam without it on a first bound, go for it.
That's really all there is too it! I've got linked below an example of it in action (sorry for the crude quality).
And to BHVR (if you're reading this); If this is a bug or unintended, I beg you; PLEASE DO NOT PATCH/ REMOVE IT. It's quite niche and hard to pull off, and it can seriously back fire if done incorrectly. Despite that, it's a really fun mechanic for Wesker to have and I implore you to leave it there as is.
Think of Blight. People loved the Hug Tech and Flicks, both of which were likely unintended features, but it made him better for it. It's the same thing with Wesker and his flicks. So please, don't patch or remove this.