[1.2.323] (2) Moar Skill Balancing

That's what he hopes, according to iAmFear the DoT interrupts after each cast and since it takes 1s before DoT starts doing damage it's effectively cancelling the DoT effect if you spam the skill.

*Cough* I just did more testing currently in GMS with inferno's DoT.

Apparently DoT DOES get interupted, but the time frame between DoT damage hits is about 1 second at most. I found at times DoT had been inflicted between attacks with inferno, but not as often as when I left the mob alone with the status effect.

So yeah, you gotta wait like 1 second between skill spam in order to get the DoT damage.