General Firepoisonarchmage

ehhh kinda stupid question but so I've been playing my newly made f/p mage(2nd job still T_T), but i did some research about how to use mist erupt properly and a question popped up... would people kill monsters b4 u finishing putting up DoT? example:@ crockies...u just put up mist a did a breath and fire demon rite b4 u paralyze ur somebody kills the monster. Does this happen? (so far haven't met any normal f/ps, met one but could 1 hit with 0 DoT mist erupt)