Unusual Damage Types in Halo 4

I’m doing this as a secondary to the Reach damage types thread posted here. After searching my own Reach history I found a few awkward damage types myself, and most were proven what caused them. Now, I decided to check my Halo 4 history to see if I could find anything myself, and these are what I stumbled upon:

Requiem:
OTHER (Radar pic)- 0 Kills; 8 Deaths
“–” (Radar pic)- 0 Kills; 2 Deaths (the name is literally 2 dashes)

Forerunners:
OTHER (Radar pic)- 0 Kills; 3 Deaths
OTHER (Radar pic)- 0 Kills; 8 Deaths
OTHER (Radar pic)- 0 Kills; 5 Deaths

Infinity:
OTHER (Radar pic)- 6 Kills; 0 Deaths
<strong>Reclaimer:</strong>
OTHER (Radar pic)- 2 Kills; 1 Death
OTHER (Radar pic)- 0 Kills; 10 Deaths
FALLING (Skull and Crossbones)- 0 Kills; 2 Deaths
Game also thinks I have 1,060 Marine Infantry kills. Wtf? lol.
<strong>Shutdown:</strong>
OTHER (Radar pic)- 0 Kills; 2 Deaths
OTHER (Radar pic)- 0 Kills; 4 Deaths
FALLING (Skull and Crossbones)- 0 Kills; 1 Death
<strong>Composer:</strong>
OTHER (Radar pic)- 1 Kill; 1 Death
OTHER (Radar pic)- 0 Kills; 4 Deaths
OTHER (Radar pic)- 0 Kills; 12 Deaths
FALLING (Skull and Crossbones)- 0 Kills; 1 Death
Game also thinks I have 530 Marine Infantry kills. Exactly half from Reclaimer.
<strong>Midnight:</strong>
OTHER (Radar pic)- 22 Kills; 0 Deaths
OTHER (Radar pic)- 2 Kills; 9 Deaths
FALLING (Skull and Crossbones)- 0 Kills; 21 Deaths
For some reason, I feel that the “Falling” death isn’t necessarily triggered by Death Barriers. In past Halo’s (not sure about 3/Reach), falling a certain distance resulted in Instant Death regardless if you didn’t touch a death barrier. I believe the same happened here when I would launch myself on those maps (specifically Midnight) and fall too far, resulting in my death before landing.
The game is very limited about the “OTHER” categories, as several missions simply have the same category type and no description, yet multiple occurrences in the same mission. Who knows what they could technically be. Anyone have any insight on all these “OTHER” weapon sub-types?