Originally Posted by
Archimedic
The dots retain the stats you had the moment they were cast. The dots already cast don't change unless refreshed. This includes when SW:P is automatically refreshed with mind flay, the spell will update to your current buffs/procs the moment it refreshes. VT and DP you have to recast if you want to benefit from a proc/buff, whether that is worth it depends on how strong the proc/buff is and how long remains on the old dot and if you would have time to refresh it normally when you should (i.e. refreshing a dot on an add that is going to be out of range).