Celtic Heroes

Just asking, I was fighting all those bosses with my clan in OW, and during the fight a wierd message sometimes pop up. Like:

All seeing (I think): when you smoke him, it says "the smoke stinged his eyes, bla bla bla..."

Swamplord, Wood Crown :" A deep wound has been inflicted on xxx."

What does those message do? Are they just for show offs or something else?

First one is when a rogue uses Smoke Bomb.
Second is the message that shows when a frozen weapon procs.