Halo 4 Flood glitch or ?

[SVEJEDAN]

Signed on to play some flood today and came across some guy who was actually in the game yet nobody could find him nor could kill him, he was last alive and didn't show up yet he was getting time per round and points. I went into theatre mode to look for him but was unable to find him nor have the game recognize him, I don't know if this is due to lag or if it's with some other things but I haven't come across this at all but for the first time today. 

 

I recorded and uploaded a video of the situation. 

 

 

Also at around 1 minute 50 seconds, you will see me just jumping around and when i landed this square activated and a big beam of light came out.  Whats that about? LOL