I’ve noticed this while playing the other day. I was leashing my Master Yi while playing with a Renata in the bottom lane, and instead of using my E right away, I waited a few seconds before casting it, and when I did, I got a free red buff of my own and a bunch of xp while walking back to lane, which then I used to get lvl 2 first and get first blood off that.

This is just a small tip if you ever decide to play Aurelion in the bottom lane. That red buff really helps you early on with the health regen it provides.