Rek'Sai vs Talon

Save Furious Bite (E) for when your Fury bar is full: the bite then deals true damage.

Come out of the ground with Un-burrow (W) under your target: they and nearby enemies take a knock-up, so you can engage or interrupt a channel.

Cast Void Rush (R) on an enemy you damaged in the last few seconds: untargetable, then unstoppable, you lunge at them, and your Un-burrow (W) comes back.

Cast Burrow (W) before crossing the map: your Tremor Sense reveals to your team nearby enemies who move unseen.

Dig with Tunnel (E) near lanes to gank and on your escape routes: each tunnel lasts and can be reused, but an enemy standing on an entrance destroys it.

Get out of the path of Rake (W), especially on the return: the returning blades slow you, and each spell that hits brings you closer to Blade's End (passive).

Push your wave whenever you can: he then has to stay and farm instead of roaming by vaulting walls with Assassin's Path (E).

If you can engage, go for him while Shadow Assault (R) is on cooldown: it's his main way out of a fight, and it comes back in 100 to 60 seconds.

Ping your team as soon as he leaves your vision, and ward the paths behind walls: Assassin's Path (E) lets him vault walls to roam through the jungle.