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Previously the handler ACKed with current position and ignored the velocity fields entirely (vcos/vsin/hspeed/vspeed were [[maybe_unused]]). The server expects the client to fly through the air on knockback — without simulation the player stays in place while the server models them as airborne, causing position desync and rubberbanding. Changes: - CameraController: add applyKnockBack(vcos, vsin, hspeed, vspeed) that sets knockbackHorizVel_ and launches verticalVelocity = -vspeed (server sends vspeed as negative for upward launches, matching TrinityCore) - Physics loop: each tick adds knockbackHorizVel_ to targetPos then applies exponential drag (KNOCKBACK_HORIZ_DRAG=4.5/s) until velocity < 0.05 u/s - GameHandler: parse all four fields, add KnockBackCallback, call it for the local player so the camera controller receives the impulse - Application: register the callback — routes server knockback to physics The existing ACK path is unchanged; the server gets position confirmation as before while the client now actually simulates the trajectory.