Why Is My Ack And Brunt Setting Things On Fire?!

[(XBOX)ultamite hero]

I was just testing out my max attack speed ack and brunt build equiped with shattering impact, and combine it with near max strength valkyr warcry build.(note, I was using final harbinger)

 

Now take note I was not using ANY FIRE ELEMNT MODS.

 

When I was in my maximum attack speed mode I noticed not only I was procing corrosive like crazy! But I was also dealing heat damage and procing HEAT! ( 0_0) can someone explain why my weapon thats attacking at the speed of light is setting THINGS ON FIRE!?

Edited December 6, 2015 by (XB1)ultamite hero

[DJ_Vauban]

can someone explain why my weapon thats attacking at the speed of light is setting THINGS ON FIRE!?

Well I imagine that if you swing that axe at the speed of light, the friction -blablablablabla- basically, it would probably be fast enough to set S#&$ on fire owo

[Kai_Shiba]

Attacking at the speed of sound can do wonderous things Johnny boy

[(XBOX)ultamite hero]

So wait is that a hidden mechanic or something? It's not letting me paste the link..

Edited December 6, 2015 by (XB1)ultamite hero

[TheFatDrake]

http://warframe.wikia.com/wiki/Final_Harbinger

 

It looks like the second combo will proc fire at the end of the combo.