Hard to be sure from the angle, but it suggests to me that PF was crabbing in because of the crosswind, then just before the mains touched, they straightened with rudder and put in some into-wind left roll to counter the rudder induced roll - which is standard - but overcooked it and/or PM said "careful !" but PF overreacted and rolled too far right.
Or the crosswind suddenly dropped.
Possibly a novice PF learning crosswind landing technique and not quite getting it correct - we've all been there. A change of underwear and a few more crosswind landings, and they will get the hang of it.