Bron? There’s no way he goes through with it. He may be a sword for hire, but he had a tight relationship with first Tyrian, and then even Jamie - taught him to fight left-handed and saved him from certain death during the ill-thought jousting charge towards the dragon.
Now who he does shoot with the crossbow, IDK...
Here’s something I can’t parse.... when Tywin melted the Stark’s Great Sword to make two smaller swords, he gave one to Jamie and one to Joffrey. Jamie then gave a sword, I think his, to Brienne to use on her quest to find/protect Sansa. So then what happened to Joffrey’s sword? Or did Jamie give Joffrey’s to Brienne - I didn’t think so since it wasn’t really his to give.