Charles looks back to Erik at the sound of his voice, startled. His head is utter silence, and he had assumed that whatever had befallen him had damaged his hearing. But, as he wakes up more, he realises that the silence inside of him is much deeper than that.

"I can't..." he struggles to speak, mouth dry and tongue swollen from the bitings it received during the seizures. "Hear..."

Hank, meanwhile, has also noticed the twitch of Charles' feet.

"How are you feeling, Professor?" he asks, expecting another seizure at any moment.