I like to think that the HOTS Promo animation is Genji making up a crazy bedtime story for Rei.
Genji: And then Diablo threw my family’s shrine bonshō at me! Rei: *gasp* Did it hurt?? Genji: I deflected it, of course. Rei: …you mean dodged it? Genji: …no, I deflected it. I had to bend backwards and the whole thing was in slow motion. Rei: That’s so cool!! Genji: But then Diablo threw me all the way across the castle grounds and I smashed into the main hall! Rei: No! Genji: Yes! Rei: Did you die? Genji: No because that’s when…*looks around Rei’s room* That’s when… uhhh…*Glances at a D.Va poster Rei has on her wall* That’s when D.Va showed up! Rei: Yaaaay!
In terms of the deflection thing, he is very good at deflection, and also redirecting things thrown at him. Rei’s thrown a snowball at him in Nepal and he’s easily caught it without even turning his head. And then Rei has to run because what goes around comes around. “Sono teido ka?”