Bart spots him and decides a friendly ambush of a hug is in order. Mostly because he's able to not be too worried about David getting a migraine from contact anymore.

"You need to calm down. Should I get you a glass of wine? Maybe something stronger? I promise you've done amazing. You always do."

He worried about his best friends sometimes. And sometimes what it said about him. But right now, well, he just wanted to be there for his friend.