Aria knew that her priority should not be to fight. She dropped Phil's sword in the end, making sure that her stamina would last as long as possible.
She did not know what her goal was in being sent to this realm, but if she was able to stall it until perhaps the 'real' Aria came to save them, then it would be the best result.
"EVERYONE, GO AND ESCAPE WHILE I DISTRACT THIS THING!" Aria instructed. The ones that still had the conscience to pick up their pace and start running away again did so.
However, the ones that couldn't continue forth all fell down to their knees as they started to harbor lifeless eyes.
There was no point in escaping anymore to them. The terror that the gigantic creature brought was too much for them to handle. Not to mention running, they found it impossible to stand.
