Guys, I don't know why this is becoming so complicated! The only reason for the cross check in the case of the PF's check is because he's looking outside, and not at the screens!
The PM doesn't need to look outside for those few critical seconds that it takes to do the check (under normal circumstances).
During LVO, when Airbus recommends both CMs look outside, the checks must be done with the aircraft stationary!
Simple, no?!