>>528017032
>is the blow up damage completely independent and on top of the normal DoT damage
This is it. It's basically just an extra instance of the DoT damage, before the enemies act. The actual DoT itself doesn't change at all.
>Is Kafka the only one so far who can “blow up” DoTs?
Kafka is the only one who can do it to anyone's DoTs, but I'm pretty sure both Gui and Luka can blow up their own DoTs.