Um ...this is like well thought out and reasonable and stuff ...are you sure you're on the right forum?

When you shoot someone with a vest, you see an icon showing that they are wearing one (just like the blast shield icon you see when you try to blow someone up).

The issue when people unload onto someone, never get even a hitmarker and then they seem to die from 1 shot is: lag

If you watch the killcam, you will see that you may not have even fired and the person who you were trying to shoot clearly fired on you 1st and dropped you legitimately.  This is lag.

Then after you re-spawn, you somehow get an assist for killing the person. This is lag compensation: The system knows you fired and backs up the clock and registers a hit.

Looks goofy, seems insane, but that is how it works.  Note: this would not be so damn evident and visible if we were not in lobbies with people from 1/2 way around the world with mickey-mouse internet connections.

I know when you get hit markers on a player that has on the ballistic vest it shows you just like when a player has on the blast shield. the lag has pissed me off from time to time. I've been around a corner and get killed but the kill cam shows me out in the open. also I have gotten many hit markers, die, but the kill cam shows me never getting off a shot.