OOC: Trouvere mentioned that I'm misremembering the grappling rules: Kalli, having bested Arthur in the opposed grapple check, now deals 1d3 nonlethal damage to Arthur. Next round (round 3), Arthur will have the first action, which he must choose from the "possible actions while grappling" section of the SRD.
If Arthur wants to escape, for instance, he can initiate an "escape" action, opposing his Escape Artist or Grapple check (Arthur's choice) against a Grapple check from Kalli.
Nothing can happen this round, though, so...
ROUND 2, Cont.
Petra and Kaleva delay.
Kalli is forced to smack Arthur on the head a bit as they grapple on the floor. (OOC: 1d3 nonlethal damage roll from Kalli, please)
ROUND 3
Slippery as an eel, Arthur manages to escape Kalli's tight embrace. (OOC: Standard action, so Arthur has a move action left after this.)
Kalli, Petra, and Kaleva... (OOC: might want to wait to see what the result of Arthur's action is first, but once that's resolved, feel free to post without waiting for a go-ahead from me)