Big Mac was vaguely aware of Applebloom holding his head during his seizure, of her trying to talk to him, but his head was filled with another conversation.
"Big Macintosh has never had an easy time befriending anypony outside the acres, but now that a mysterious filly has entered his life he finds his whole life being turned on its head.
I love my brother. I know lesser mares would've quit by now. When he boarded that train to the changeling territory, he was still Macintosh. When he came back he was still the same, but... different.