It is Jurathor's turn in round 153. Jurathor is originally at 100N90E, 5 feet NW of where you have him (he had to move into Proteus' space to grapple). The other two positions are correct.
Round 153: Jurathor steps back 5 feet SE to 95E95E (21 Fort save) and wails on Proteus.
Um, actually he misses completely (natural 1 with bite, failed miss chance on all the rest!).