After conversion a player will sometimes spawn with the appearace of a spartan, and will show up on the radar as an enemy but will be a flood and you get a betrayal for killing them.
Hard Light shield only stops melee attacks about 50% of the time, at best.
Flood melee-charging when they shouldnt be able to, i.e. before reticle is red.(and no, not talking about thruster pack)
Red enemy nametag will apear above an enemy that is in stealth.
Im sure there are more, this is just what I remember off the top of my head, that I have witnessed afew times in matches.
That happened to some guy who was on my team. I found the perfect hiding spot and there was a plant so I blended in perfectly. Then some guy followed me and he was trying to jump into the spot with me and he fell off the map and it counted as suicide. Later in the match, I started taking damage and I heard someone shooting at me. Than I see an enemy Spartan shooting at me so I kill him with a headshot. He was the same guy who followed me to my spot and now all the flood people know where I am.
I kill around 3 but that guy who followed me hits me with a headshot and I join the flood. I kill him for letting them find me and using a glitch to infect me and he boots me. 343 needs to fix this.
All your points are valid except for the lunge. The flood actually can get HUGE lunges! I noticed while I was mid air on Haven that I was able to lunge at least 50% farther than the normal sword lunge