Bolas exploding instantly is especially effective with the Imminent Doom rune.
As of patch 2.6.9, it also increases Bolas damage.
Stats (Level 31)Edit
"Emimei was rumored to be the offspring of the famed fletcher Cirri. Possibly even more talented than her father, she discovered a way to integrate a superior ignition system into demon hunter bola weapons. Exert enough pressure on a bola's spike and the explosive charge within triggers, causing the bola to detonate upon impact with a target." —The Craft of War by Diadra the Scholar