Cavemen

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I turned debug on, and here's what I found. The graphic always just shows two bolas flying in the air.

Sometimes there aren't enough AP to throw both sets of bolas:

blastsqr: unr247 x23 y14 aoe0 dmg0 eff2 spc1073741825 as-1 al0^M
blastsqr: unr247 x23 y14 aoe0 dmg65536 eff11 spc1073741824 as-1 al0^M
blastsqr: unr247 x22 y14 aoe0 dmg0 eff2 spc1073741825 as-1 al0^M
blastsqr: unr247 x22 y14 aoe0 dmg65536 eff11 spc1073741824 as-1 al0^M

And sometimes some of the bolas will hit the same square:

blastsqr: unr247 x22 y16 aoe0 dmg0 eff2 spc1073741825 as-1 al0^M
blastsqr: unr247 x22 y16 aoe0 dmg65536 eff11 spc1073741824 as-1 al0^M
blastsqr: unr247 x22 y16 aoe0 dmg0 eff2 spc1073741825 as-1 al0^M
blastsqr: unr247 x22 y16 aoe0 dmg65536 eff11 spc1073741824 as-1 al0^M
blastsqr: unr247 x24 y15 aoe0 dmg0 eff2 spc1073741825 as-1 al0^M
blastsqr: unr247 x24 y15 aoe0 dmg65536 eff11 spc1073741824 as-1 al0^M
blastsqr: unr247 x22 y15 aoe0 dmg0 eff2 spc1073741825 as-1 al0^M
blastsqr: unr247 x22 y15 aoe0 dmg65536 eff11 spc1073741824 as-1 al0^M

Even if you're throwing just 2 bolas, they sometimes hit the same square.

Double bolas are more efficient than quickness boots plus a bola, since you're guaranteed to fire twice, and the cost is less. Unless you've got some black steel tower shields that you inherited from somewhere and don't have any other units to stick them on.