He wasn’t on his mobile phone, he wasn’t talking into his radio, he didn’t have his head down, he wasn’t looking at his computer, he wasn’t wasn’t paying attention…although he was 1-handed for a second…
WvA moves over in normal fashion, VDP reacts late and makes a severe veer, which then reduces JA’s time to see and react to basically nothing = impact. Added, the moto was slowing down when the first two passed and had stopped when it was JA’s turn.