Don’t know if this has been commented on elsewhere but the slow-mo footage from behind the goal shows clearly Party raise his hands and push Rodri sideways as they both move towards the corner flag.
This was not a coming together or an unfortunate landing. It was a piece of shithousery. Party almost certainly didn't intend a season-threatening injury, but he took the risk with Rodri's knee.
Apart from anything else it should have been a penalty.
More seriously, it is difficult to argue that Rodri was not deliberately targeted. That much was suggested by the evidence of the first three seconds.
Arsenal really are a bunch of cunts.