As Ruven was busy thinking of the best way to kill Prince Ailwin in this standoff.
Celaena had already recited an acceleration spell on herself, making herself almost invisible to the untrained eyes of everyone in the room as she zoomed from person to person injecting needles into their bodies.
Mika had given her these needles, she didn't know what it was because all Mika said "...was it will make them talk...or they die trying to stay silent."
When the job was finished, she went back to her spot before releasing the incantation.
Hycis glanced to his side and saw Celaena looking calm and relax in the middle of this dangerous situation they were in. He wondered if she realizes that this was no time to be yawning in front of a group of killers.
Celaena had trust in Mikaela, though she will never admit it to her face, but she did fully believe that Mika's needles will do what she said they will. So she wasn't as worried as Hycis and Nylian were.