Sup Sigil of Battle? For an Ele?

In more than one location I have seen a recommendation of using a Sup Sigil of Battle on one of the daggers of a DD Ele, the other being a Sup Sigil of Bloodlust. My confusion is why Battle? The boon of Might is applied when switching to the Sup Battle applied weapon in combat and lasts for 20 sec. But, as you all know, Elementalists do not enjoy the luxury of weapon swap. So why would I spend 3g+ for this sigil which would be utterly useless , imo, for an Ele? School me plz.

I think Bloodlust/Corruption would be a better option.

Switching attunements (which you should be doing every few seconds) triggers the weapon swap.

Ah!.. Well that certainly changes thing.

but remember that you must have a sigil of battle on BOTH daggers for it to work. I tried it with only one and it didn't work.

Nente/Wes wrote:

but remember that you must have a sigil of battle on BOTH daggers for it to work. I tried it with only one and it didn't work.

No you don't. You probably weren't in combat or something?
It has an ICD of 10 seconds iirc btw