Aright. Provoked attack.
Spear: (1d20+1)[4]
Dmg: (1d6-1)[4]
One of the spear jockies opts to charge you after the slinger takes his best shot. Insert readied AoO here.
Sling: (1d20+3)[16]
Dmg: (1d3-1)[1]
Spear: (1d20+1)[16]
Dmg: (1d6-1)[5]
The others don't move.