'He couldn't talk' seems to be the only useful information about the symptoms? The article also says, '
Fincke said he can't provide any more details about his medical episode.' This is intriguing :) But then, excuse my ignorance, but sound doesn't propagate through a vacuum, right? So? I'm ignorant, and I think there's breathable air artificially placed inside the capsule, so the sound can travel there, but there could probably be some gaps. I don't know.