My guess is this was a note left to the typesetter(?) to add the footnote, and the text that was supposed to go in the word balloon was something along the lines of "the previous sage was devoured", since it can mean both being cannibalized and sexually consumed. Looks like QC missed this page.
It almost feels like the author has a huge story they want to tell, and they're worried about it getting axed before telling everything, so they're rushing through at breakneck speed.
Going back and reading this again, while "ptera" might be a pokemon, it's also the ancient greek plural form of pterón, meaning "wing". That's where we get pterodactyl - literally "wing fingers", and helicopter, "spiral wing".
It was so briefly mentioned and never returned to that I'm not surprised other people don't remember. He's definitely Meroza's child, wherever she ended up.
The implication that not only does "Boston" exist somewhere in this world, but also professional wrestling - to the extent that the same maneuver developed independently from its original world.
Or maybe Boston is a multi-dimensional construct, existing in all places across all of time and...