In Prototype, you can use a uber move to save you when your dieing. Which is to go into porcupine mode and spike everything. That got me thinking. 'Hey, what about a special move to do if your about to die in Halo!' So I've got some examples.
Medals
Gravity, you win again.
Sword or any other sharp object falls on someone and kills them.
Kinetic Energy
Sword flies when you die in the process of lunging and kills someone.
Spike'd
Melee with a needler when you die, and the needles fly out to kill anyone near.
X = Slazorx2
Spartan Laser Charges 2x faster when about to die.
Convicted Murderer(Unknown)
Combat Knife flies when you die meleeing
How to:
Gravity, you win again:
When you have a sword, a needler, or any bladed weapon, try to kill someone jumping, it may land on them and kill em.
Kinetic Energy:
I feel bad for the Bulltruer. Do you really need a 'How To'
Spike'd:
When you don't have any shields, and have a needler, start meleeing. Rare to come out when your still alive.
X = Splazorx2:
No shields, two times the charge.
Convicted Murderer(Unknown):
No How-To for this one, its unknown if theres a combat knife in the game after all.
Now, this is just an idea. I don't want any trolls to come and spit their 7roll juice on everything