proc threat on resist

[bobjonesp99]

i was recently testing wand threat and was surprised to find that a single wand of frost bolt click (6 damage DD) generated enough threat that it took 3 bow shots from 20 dmg bow with 2 dmg arrows (that did 22, 14, 0 dmg, respectively) before pulling threat. sometimes i wonder if proc threat really is the whole 'spell component capped at 400 + DD + DoT' calculation everyone suggests, or if its more nuanced.