UNDOCUMENTED MECHANICS
Monsters within 10 yards flee.
Monsters flee for 60 frames, about 2.4s.
"Slows Enemies" above follows a diminishing curve, not a flat gain per level; the other numbers in the same block do not: 11% at level 1, 37% at 5, 51% at 10, 63% at 20, 75% at the limit. Reaching the limit takes skill level 60, gear bonuses included, so the first few points are worth far more than the last ones.
On impact it spawns a second missile; that damage is not included in the figure above.