Ekko' time rewind

Hello riot,after reading many ekko facts,watching the cinematic and reading riot comments I can't figure out something; In what way ekko rewinds his time? Does he rewind his own time stream? Or does he rewinds the entire galaxy's timeline? Or maybe a small area going back in time? Does he explore other dimensions?if yes,how does he come back? In the cinematic and comic he rewinds the entire even back,both Ajuna and the killer,and that Robot thing. Does that affect entire Runeterra?
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