This is how Opening and Thunderwing talks to Twilight goes in Out of Twilight's Head.
[The film starts with recaps of the events of Cybonic Plague]
Optimus Prime: (voice) Prievously on Cybonic Plague.
Ultra Magnus: A crash landing. Buried here for centuries.
Ratchet: These Autobots didn't perish in the crash! They're displaying the effects of a virus!
Thunderwing: [in Twilight's mind] I'm out. Ha ha ha ha.
[end of recaps]
[Twilight leaves the medical room and stops in the hallway as her eyes turn purple]
Thunderwing: [in Twilight's mind] It is a matter of time before anyone discovers all is not right with you, Twilight. I must reclaim my body which means taking complete and total control of yours.
[Twilight uses Dark Magic, which Starlight, Trixie, Thorax, and Discord notice]
Starlight Glimmer: What?
Trixie: Something's up.
Thorax: Should we ask?
Discord: Okay. Nobody panic. We gonna find out what's happening but we need support. Signal Bumblebee.