Yes, since this hasn't been in combat time, you can consider all of these interactions to have added up to a minute. The phantom will have spawned after you made your action and stepped back in the cell..
The creature's face shifts back to that of the bizarre grey humanoid, and she taunts Dervak: "He acts tough, don't he? But in the end he-" the creature starts when she hears the terrible phantom moan, and in a confused moment, jumps and becomes unbalnced. It manages to catch itself on the table to keep itself from falling, but the keychain clatters to the ground and slides towards the middle of lip of the table, under where the poor human's thrashing feet have stilled. The creature, unaware of this, draws another scalpel from the pocket of the doctor's smock it wears and brandished it at the ghost as it takes a few steps backwards.
The keys are under the table, well out of reach of Dervak through the bars. The creature took a 5-foot step back but is still reachable through Dervak's bars. The keys with a 12+ perception check as a move action, indicating positioning inside the cells to see, would be just barely visible from both Mala and Cerio's and Julius and Oscar's cells.
Oscar's mage hand grabs a hold of a pair of wicked-looking shears from the table and floats them to the cell; these can be used as an improvised weapon, 1d4 slashing, or even as improvised thieves tools with enough skill.