A bit more information on
[Dislodged Foreign Object]; for fire it seems to proc of any spell cast which is expected, however it also procs from Living Bomb
ticks, application and explosion. Also it seems to proc from Mirror Image spell casts, that is the frostbolts/fireblasts they cast (this is not certain I'm still trying to reproduce it).
In general the behaviour is somewhat odd, the buff is applied instantly if it procs from a spell cast, however from LB ticks it is applied around 300 milliseconds later.