Mysterious speedster

When Kaz woke up he was fully healed. Everything was still. Even the bird in the air wasn't moving.

Kaz : What happened? Am I in limbo?

???: No you're in hell! Now you will suffer for eternity!

All of a sudden everything started moving again.

???: Dammit, I thought it would last longer this time!

Kaz: Who are you?

??: A friend, an enemy. You can say I'm the guy who knows your life was a waste, and now it will change!

Kaz: Will it still be a waste?

???: Not if you do as I say!

He disappeared almost like he teleported, but blue lightning showed his path. Kaz started to jog to his house.