A bit odd. As you said, Petros, PANTANASSA (52tbp) is racing back from the scene to Piraeus at a steady 11kn. ETA Piraeus 10.00UTC 3/10, and not indicating that she has anything in tow, and certainly not a capsized vessel
Meanwhile MED FOS (98tbp) plods on at 1kn ESE-wards, showing restricted manoeuvrability. All that is consistent with the tow (VesselTracker "The wreck was now pulled at an extremely slow speed towards Cyprus").
So it seems likely to me that both tugs were involved in the recovery of the capsized vessel. PANTANASSA sailed from off Neapoli Voion on 26/9, arriving Augusta STS area 29/9; MED FOS was a day behind, sailing from Lavrion nr Piraeus 27/9 and arriving in the casualty area 29/9.
If PANTANASSA is still involved, perhaps she is to pick up further equipment and rendezvous with MED FOS later.