A somewhat new of a Spartan Ops video just surfaced that was filmed at SDCC, and at one point you can see the Promethean EMP grenade.
The video is off-screen but at about 11:00 you can see a glimpse of the EMP grenade in use at the upper right hand corner, and the what it causes. When the EMP grenade is used, I guess, it's similar to the power drainer equipment from Halo 3, it probably doesn't kill but takes out shields and power out of vehicles and other sources of power. It has a really cool effect and I suggest you to check it out.
Here is a picture of it:
Try to make out of what it is as best of you can, but I believe it is some ball of electricity (I'm not the best at describing). The power drainer from Halo 3 has an effect just like that too, except it's less transparent and it's blue.
Worked somewhat hard to bring a good blog towards you. Painful though because had to deal with errors after attempting to insert new templates but I just stopped trying and made the blog as polished as I could. Hope you guys enjoy it, I will tweak it every now and then.
Also, to the right is a poll whether I should or shouldn't have a forum. I'm not very sure if I should make one or not but that's where you can come in. Simply vote yes or no, or put soon if you think I should wait a bit. Its up to you guys, please contribute, and you get a Master Chief cookie. No, not really.