Poor Rhaegal. Been through all of this just to be taken down by a pirate that looks like a Lifetime original version of Pacy Witter. He didn't have to go out like that. He was a good dragon, possibly the most gentle of them all. He should have dropped Jon during the Battle of Winterfell and never looked back! Just flown to Essos and been a boss b*tch out there.
Personally, if I was dragon and my mother didn't let me rest after I got entire HOLES in my wings from fighting with a bunch of wights, I wouldn't be flying with her. But that's just me. Rhaegal was a real one and he went down like one. RIP.