The patrol moves to quiet things down, but the bar patrons seem to be enraged. They begin yelling, and run up to you all, surrounding the patrol as well.
The bar patrons made full moves and so won't attack this round. Each of you who isn't a dragonborn may now attack. Consider there are at least 2 who have moved up in front of each of you, and more coming.
Rolls
Wis save vs DC 13 - (1d20+2)
(19) + 2 = 21
Braining the Dragonborn, disadvantage - (1d20+4, 1d20+4, 1d6+2)
1d20+4 : (9) + 4 = 13
1d20+4 : (15) + 4 = 19
1d6+2 : (1) + 2 = 3